Nitrogen-containing heterocyclic compound

ABSTRACT

The present invention provides a compound having a cholinergic muscarinic M1 receptor positive allosteric modulator activity, which may be useful as medicaments such as a prophylactic or therapeutic drug for Alzheimer&#39;s disease, schizophrenia, pain, sleep disorder, Parkinson&#39;s disease dementia, dementia with Lewy bodies and the like, and the like. The present invention relates to a compound represented by the formula (I) 
     
       
         
         
             
             
         
       
     
     wherein ring A is an optionally substituted 5- or 6-membered ring; R is a C 1-6  alkyl group substituted by 1 to 5 halogen atoms; and X is —CH═ or —N═, or a salt thereof.

TECHNICAL FIELD

The present invention relates to a nitrogen-containing heterocyclic compound having a cholinergic muscarinic M1 receptor positive allosteric modulator activity and useful as a medicament such as a prophylactic or therapeutic drug for Alzheimer's disease, schizophrenia, pain, sleep disorder, Parkinson's disease dementia, dementia with Lewy bodies and the like, and the like. As used herein, the positive allosteric modulator activity refers to an action to potentiate receptor function by binding to a moiety different from that of an endogenous activator (acetylcholine for this receptor).

BACKGROUND OF THE INVENTION

Acetylcholine is a neurotransmitter that induces signal transduction in the central nervous system and the neuromuscular connections (the parasympathetic nerve and motor nerve). In the central nervous system, nuclei of origin of the acetylcholine neuron are in the brain stem and forebrain, and those acetylcholine neurons project to cerebral cortex, hippocampus, and limbic area. In addition, some interneurons in some brain areas such as striatum utilize acetylcholine as a neurotransmitter. Acetylcholine receptor is classified into a ligand dependent ion channel (cholinergic nicotinic receptor) and a G-protein-conjugated receptor (cholinergic muscarinic receptor). The cholinergic muscarinic receptor is one kind of receptor for excitatory neurotransmitter acetylcholine, and was named based on the selective activation of the receptor by muscarine. The muscarinic receptor is further classified into subtypes of M1 to M5, and the M1 receptor is known to be widely distributed mainly in the brain, and deeply involved particularly in learning, memory, sleep, neuropathic pain and the like. The importance of cholinergic muscarinic M1 receptor in brain physiology is well known, and a compound having an M1 receptor function enhancing action is expected to be useful as a prophylactic or therapeutic drug for mental diseases, neurodegenerative diseases, memory disorders, pain, sleep disorders and the like (non-patent document 1).

WO 2006/020879A1 (patent document 1) discloses the following compound as a glutamate receptor modulator which is effective for neurological and psychiatric disorder associated with glutamate dysfunction:

wherein each symbol is as defined in the document.

WO 2013/063549A1 (patent document 2) discloses the following compound as a compound effective for neurological and psychiatric disorder associated with muscarinic acetylcholine receptor dysfunction.

wherein each symbol is as defined in the document.

Bioorganic & Medicinal Chemistry Letters, 20 (2010), 1972-1975 (non-patent document 2) discloses the following compound and the like as a M1 receptor positive allosteric modulator:

Gordon, C. P., Byrne, N., McCluskey, A. Green Chem., 2010, 12, 1000-1006. (non-patent document 3) discloses the following compounds similar to the compound of the present invention.

WO 2010/096338A1 (patent document 3) discloses the following compound as an M1 receptor positive allosteric modulator effective for Alzheimer's disease, schizophrenia, pain or sleep disorder.

wherein each symbol is as defined in the document.

WO 95/030647A1 (patent document 4) discloses the following compound similar to the compound of the present invention.

wherein each symbol is as defined in the document.

WO 2007/139464A1 (patent document 5) discloses the following compound as a CB₁ receptor ligand effective for pain, cancer, multiple sclerosis, Parkinson's disease, Huntington's chorea, Alzheimer's disease, anxiety disorder, gastrointestinal disorder and cardiovascular disorder.

wherein each symbol is as defined in the document.

US 2008/0108659A1 (patent document 6) discloses the following compound as a compound having a poly(ADP ribose)polymerase (PARP) activity, and useful for cancer, central nervous system disease, inflammatory disease and the like.

wherein each symbol is as defined in the document.

WO 2011/006794A1 (patent document 7) discloses the following compound as a compound which selectively inhibits the activity of poly (ADP-ribose) polymerase PARP-1 with respect to poly (ADP-ribose) polymerase PARP-2 and useful for cancer, cardiovascular diseases, central nervous disorders and the like.

wherein each symbol is as defined in the document.

WO 2012/003147A1 (patent document 8) discloses the following compound as a compound having an M1PAM activity, and effective for Alzheimer's disease, schizophrenia, pain, and sleep disorder.

wherein each symbol is as defined in the document.

WO 2012/158475A1 (patent document 9) discloses the following compound as a compound having an M1PAM activity, and effective for Alzheimer's disease and the like.

wherein each symbol is as defined in the document.

WO 2013/129622A1 (patent document 10) discloses the following compound as a compound having an M1PAM activity, and effective for Alzheimer's disease and the like.

wherein each symbol is as defined in the document.

WO 2015/028483A1 (patent document 11) discloses the following compound as a muscarinic M1 receptor positive allosteric modulator, which is effective for Alzheimer's disease and the like.

wherein each symbol is as defined in the document.

WO 2015/044072A1 (patent document 12) discloses the following compound as a muscarinic M1 receptor positive allosteric modulator, which is effective for Alzheimer's disease and the like.

wherein each symbol is as defined in the document.

WO 2015/049574A1 (patent document 13) discloses the following compound as a muscarinic acetylcholine receptor M1 positive allosteric modulator, which is effective for Alzheimer's disease and the like.

wherein each symbol is as defined in the document.

DOCUMENT LIST Patent Documents

-   patent document 1: WO 2006/020879A1 -   patent document 2: WO 2013/063549A1 -   patent document 3: WO 2010/096338A1 -   patent document 4: WO 95/030647A1 -   patent document 5: WO 2007/139464A1 -   patent document 6: US 2008/0108659A1 -   patent document 7: WO 2011/006794A1 -   patent document 8: WO 2012/003147A1 -   patent document 9: WO 2012/158475A1 -   patent document 10: WO 2013/129622A1 -   patent document 11: WO 2015/028483A1 -   patent document 12: WO 2015/044072A1 -   patent document 13: WO 2015/049574A1

Non-Patent Documents

-   non-patent document 1: Nature Reviews Drug Discovery, 2007, 6,     721-733. -   non-patent document 2: Bioorganic & Medicinal Chemistry Letters,     20 (2010) 1972-1975. -   non-patent document 3: Gordon, C. P., Byrne, N., McCluskey, A. Green     Chem., 2010, 12, 1000-1006.

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

The development of a compound having a cholinergic muscarinic M1 receptor (M1 receptor) positive allosteric modulator activity and useful as a prophylactic or therapeutic drug for Alzheimer's disease, schizophrenia, pain, sleep disorder, Parkinson's disease dementia, dementia with Lewy bodies and the like is desired. As used herein, the positive allosteric modulator activity means an action to bind to a site different from an endogenous activator (acetylcholine in this receptor) and potentiate the receptor function.

Means of Solving the Problems

The present inventors have conducted intensive studies in an attempt to solve the aforementioned problems and found that a compound represented by the following formula (I) has a cholinergic muscarinic M1 receptor positive allosteric modulator activity, which resulted in the completion of the present invention.

Accordingly, the present invention relates to the following.

[1] A compound represented by the formula (I):

wherein ring A is an optionally substituted 5- or 6-membered ring; R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; and

X is —CH═ or —N═

or a salt thereof (sometimes to be abbreviated as “compound (I)” in the present specification); [2] the compound of the above-mentioned [1], wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms;

ring A is a benzene ring, a 5- or 6-membered monocyclic aromatic heterocycle, or a 5- or 6-membered monocyclic non-aromatic heterocycle, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom, (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group, (3) a 5- to 14-membered aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms, and

(b) a C₃₋₆ cycloalkyl group,

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group, (6) a C₃₋₆ cycloalkyl group, (7) a tetrahydrofuranyl group, (8) a C₇₋₁₆ aralkyl group, and (9) a carbamoyl group; and

X is —CH═ or —N═,

or a salt thereof; [3] the compound of the above-mentioned [1]-[2], wherein ring A is a benzene ring, a 5- or 6-membered monocyclic aromatic heterocycle, or a 5- or 6-membered monocyclic non-aromatic heterocycle, each of which is optionally substituted by 1 to 3 substituents selected from (1) a halogen atom, (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group, (3) a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms, and

(b) a C₃₋₆ cycloalkyl group,

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group, (6) a C₃₋₆ cycloalkyl group, (7) a tetrahydrofuranyl group, (8) a C₇₋₁₆ aralkyl group, and (9) a carbamoyl group, or a salt thereof; [4] the compound of the above-mentioned [1]-[3], wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; and

ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom, (2) a mono-C₁₋₆ alkyl-carbamoyl group, and (3) (i) a pyrazolyl group, (ii) a triazolyl group, (iii) an isothiazolyl group, (iv) a pyridyl group, or (v) an indazolyl group, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms; and

X is —CH═ or —N═,

or a salt thereof; [5] the compound of the above-mentioned [1]-[4], wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms;

ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom, (2) a mono-C₁₋₆ alkyl-carbamoyl group, and (3) (i) a pyrazolyl group, or (ii) a pyridyl group, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms; and

X is —N═,

or a salt thereof; [6] the compound of the above-mentioned [1]-[4], wherein R is a C₁-C₆ alkyl group substituted by 1 to 5 halogen atoms;

ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom, and (2) (i) a pyrazolyl group, (ii) a triazolyl group, (iii) an isothiazolyl group, or (iv) an indazolyl group, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms; and

X is —CH═,

or a salt thereof; [7] the compound of the above-mentioned [1]-[4], wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms;

ring A is a benzene ring substituted by

(1) one halogen atom, and/or (2) one pyrazolyl group substituted by 1 to 3 C₁₋₆ alkyl groups; and

X is —CH═ or —N═,

or a salt thereof; [8] the compound of the above-mentioned [1]-[5] or [7], wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms;

ring A is a benzene ring substituted by

(1) one halogen atom, and/or (2) one pyrazolyl group substituted by 1 to 3 C₁₋₆ alkyl groups; and

X is —N═,

or a salt thereof; [9] the compound of the above-mentioned [1]-[4] or [6]-[7], wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms;

ring A is a benzene ring substituted by one pyrazolyl group substituted by 1 to 3 C₁₋₆ alkyl groups; and

X is —CH═,

or a salt thereof; [10] 4-(2,2-difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one or a salt thereof; [11] 4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one or a salt thereof; [12] 4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one or a salt thereof; [13] a medicament comprising the compound of any one of the above-mentioned [1] to [12] or a salt thereof; [14] the medicament of the above-mentioned [13], which is a cholinergic muscarinic M1 receptor positive allosteric modulator; [15] the medicament of the above-mentioned [13], which is a prophylactic or therapeutic agent for Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies; [16] the compound of the above-mentioned [1] to [12] or a salt thereof for use in the prophylaxis or treatment of Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies; [17] a method of cholinergic muscarinic M1 receptor positive allosteric modulation in a mammal, comprising administering an effective amount of the compound of the aforementioned [1] to [12] or a salt thereof to said mammal; [18] a method for the prophylaxis or treatment of Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies in a mammal, comprising administering an effective amount of the compound of the aforementioned [1] to [12] or a salt thereof to said mammal; [19] use of the compound of any one of the aforementioned [1] to [12] or a salt thereof in the production of a prophylactic or therapeutic agent for Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies.

Effect of the Invention

The compound of the present invention has a cholinergic muscarinic M1 receptor positive allosteric modulator activity, and is useful as a medicament such as a prophylactic or therapeutic drug for, for example, Alzheimer's disease, schizophrenia, pain, sleep disorder, Parkinson's disease dementia, dementia with Lewy bodies and the like.

DETAILED DESCRIPTION OF THE INVENTION

The definition of each substituent used in the present specification is described in detail in the following. Unless otherwise specified, each substituent has the following definition.

In the present specification, examples of the “halogen atom” include fluorine, chlorine, bromine and iodine.

In the present specification, examples of the “C₁₋₆ alkyl group” include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, 1-ethylpropyl, hexyl, isohexyl, 1,1-dimethylbutyl, 2,2-dimethylbutyl, 3,3-dimethylbutyl and 2-ethylbutyl.

In the present specification, examples of the “optionally halogenated C₁₋₆ alkyl group” include a C₁₋₆ alkyl group optionally having 1 to 7, preferably 1 to 5, halogen atoms. Specific examples thereof include methyl, chloromethyl, difluoromethyl, trichloromethyl, trifluoromethyl, ethyl, 2-bromoethyl, 2,2,2-trifluoroethyl, tetrafluoroethyl, pentafluoroethyl, propyl, 2,2-difluoropropyl, 3,3,3-trifluoropropyl, isopropyl, butyl, 4,4,4-trifluorobutyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, 5,5,5-trifluoropentyl, hexyl and 6,6,6-trifluorohexyl.

In the present specification, examples of the “C₂₋₆ alkenyl group” include ethenyl, 1-propenyl, 2-propenyl, 2-methyl-1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 3-methyl-2-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 4-methyl-3-pentenyl, 1-hexenyl, 3-hexenyl and 5-hexenyl.

In the present specification, examples of the “C₂₋₆ alkynyl group” include ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3-pentynyl, 4-pentynyl, 1-hexynyl, 2-hexynyl, 3-hexynyl, 4-hexynyl, 5-hexynyl and 4-methyl-2-pentynyl.

In the present specification, examples of the “C₃₋₁₀ cycloalkyl group” include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, bicyclo[2.2.1]heptyl, bicyclo[2.2.2]octyl, bicyclo[3.2.1]octyl and adamantyl.

In the present specification, examples of the “optionally halogenated C₃₋₁₀ cycloalkyl group” include a C₃₋₁₀ cycloalkyl group optionally having 1 to 7, preferably 1 to 5, halogen atoms. Specific examples thereof include cyclopropyl, 2,2-difluorocyclopropyl, 2,3-difluorocyclopropyl, cyclobutyl, difluorocyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl.

In the present specification, examples of the “C₃₋₁₀ cycloalkenyl group” include cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl and cyclooctenyl.

In the present specification, examples of the “C₆₋₁₄ aryl group” include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl and 9-anthryl.

In the present specification, examples of the “C₇₋₁₆ aralkyl group” include benzyl, phenethyl, naphthylmethyl and phenylpropyl.

In the present specification, examples of the “C₁₋₆ alkoxy group” include methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, tert-butoxy, pentyloxy and hexyloxy.

In the present specification, examples of the “optionally halogenated C₁₋₆ alkoxy group” include a C₁₋₆ alkoxy group optionally having 1 to 7, preferably 1 to 5, halogen atoms. Specific examples thereof include methoxy, difluoromethoxy, trifluoromethoxy, ethoxy, 2,2,2-trifluoroethoxy, propoxy, isopropoxy, butoxy, 4,4,4-trifluorobutoxy, isobutoxy, sec-butoxy, pentyloxy and hexyloxy.

In the present specification, examples of the “C₃₋₁₀ cycloalkyloxy group” include cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, cycloheptyloxy and cyclooctyloxy.

In the present specification, examples of the “C₁₋₆ alkylthio group” include methylthio, ethylthio, propylthio, isopropylthio, butylthio, sec-butylthio, tert-butylthio, pentylthio and hexylthio.

In the present specification, examples of the “optionally halogenated C₁₋₆ alkylthio group” include a C₁₋₆ alkylthio group optionally having 1 to 7, preferably 1 to 5, halogen atoms. Specific examples thereof include methylthio, difluoromethylthio, trifluoromethylthio, ethylthio, propylthio, isopropylthio, butylthio, 4,4,4-trifluorobutylthio, pentylthio and hexylthio.

In the present specification, examples of the “C₁₋₆ alkyl-carbonyl group” include acetyl, propanoyl, butanoyl, 2-methylpropanoyl, pentanoyl, 3-methylbutanoyl, 2-methylbutanoyl, 2,2-dimethylpropanoyl, hexanoyl and heptanoyl.

In the present specification, examples of the “optionally halogenated C₁₋₆ alkyl-carbonyl group” include a C₁₋₆ alkyl-carbonyl group optionally having 1 to 7, preferably 1 to 5, halogen atoms. Specific examples thereof include acetyl, chloroacetyl, trifluoroacetyl, trichloroacetyl, propanoyl, butanoyl, pentanoyl and hexanoyl.

In the present specification, examples of the “C₁₋₆ alkoxy-carbonyl group” include methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl, sec-butoxycarbonyl, tert-butoxycarbonyl, pentyloxycarbonyl and hexyloxycarbonyl.

In the present specification, examples of the “C₆₋₁₄ aryl-carbonyl group” include benzoyl, 1-naphthoyl and 2-naphthoyl.

In the present specification, examples of the “C₇₋₁₆ aralkyl-carbonyl group” include phenylacetyl and phenylpropionyl.

In the present specification, examples of the “5- to 14-membered aromatic heterocyclylcarbonyl group” include nicotinoyl, isonicotinoyl, thenoyl and furoyl.

In the present specification, examples of the “3- to 14-membered non-aromatic heterocyclylcarbonyl group” include morpholinylcarbonyl, piperidinylcarbonyl and pyrrolidinylcarbonyl.

In the present specification, examples of the “mono- or di-C₁₋₆ alkyl-carbamoyl group” include methylcarbamoyl, ethylcarbamoyl, dimethylcarbamoyl, diethylcarbamoyl and N-ethyl-N-methylcarbamoyl.

In the present specification, examples of the “mono- or di-C₇₋₁₆ aralkyl-carbamoyl group” include benzylcarbamoyl and phenethylcarbamoyl.

In the present specification, examples of the “C₁₋₆ alkylsulfonyl group” include methylsulfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl, butylsulfonyl, sec-butylsulfonyl and tert-butylsulfonyl.

In the present specification, examples of the “optionally halogenated C₁₋₆ alkylsulfonyl group” include a C₁₋₆ alkylsulfonyl group optionally having 1 to 7, preferably 1 to 5, halogen atoms. Specific examples thereof include methylsulfonyl, difluoromethylsulfonyl, trifluoromethylsulfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl, butylsulfonyl, 4,4,4-trifluorobutylsulfonyl, pentylsulfonyl and hexylsulfonyl.

In the present specification, examples of the “C₆₋₄₄ arylsulfonyl group” include phenylsulfonyl, 1-naphthylsulfonyl and 2-naphthylsulfonyl.

In the present specification, examples of the “substituent” include a halogen atom, a cyano group, a nitro group, an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group, an acyl group, an optionally substituted amino group, an optionally substituted carbamoyl group, an optionally substituted thiocarbamoyl group, an optionally substituted sulfamoyl group, an optionally substituted hydroxy group, an optionally substituted sulfanyl (SH) group and an optionally substituted silyl group.

In the present specification, examples of the “hydrocarbon group” (including “hydrocarbon group” of “optionally substituted hydrocarbon group”) include a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₂₋₆ alkynyl group, a C₃₋₁₀ cycloalkyl group, a C₃₋₁₀ cycloalkenyl group, a C₆₋₁₄ aryl group and a C₇₋₁₆ aralkyl group.

In the present specification, examples of the “optionally substituted hydrocarbon group” include a hydrocarbon group optionally having substituent(s) selected from the following substituent group A.

[Substituent Group A]

(1) a halogen atom, (2) a nitro group, (3) a cyano group, (4) an oxo group, (5) a hydroxy group, (6) an optionally halogenated C₁₋₆ alkoxy group, (7) a C₆₋₁₄ aryloxy group (e.g., phenoxy, naphthoxy), (8) a C₇₋₁₆ aralkyloxy group (e.g., benzyloxy), (9) a 5- to 14-membered aromatic heterocyclyloxy group (e.g., pyridyloxy), (10) a 3- to 14-membered non-aromatic heterocyclyloxy group (e.g., morpholinyloxy, piperidinyloxy), (11) a C₁₋₆ alkyl-carbonyloxy group (e.g., acetoxy, propanoyloxy), (12) a C₆₋₁₄ aryl-carbonyloxy group (e.g., benzoyloxy, naphthoyloxy, 2-naphthoyloxy), (13) a C₁₋₆ alkoxy-carbonyloxy group (e.g., methoxycarbonyloxy, ethoxycarbonyloxy, propoxycarbonyloxy, butoxycarbonyloxy), (14) a mono- or di-C₁₋₆ alkyl-carbamoyloxy group (e.g., methylcarbamoyloxy, ethylcarbamoyloxy, dimethylcarbamoyloxy, diethylcarbamoyloxy), (15) a C₆₋₁₄ aryl-carbamoyloxy group (e.g., phenylcarbamoyloxy, naphthylcarbamoyloxy), (16) a 5- to 14-membered aromatic heterocyclylcarbonyloxy group (e.g., nicotinoyloxy), (17) a 3- to 14-membered non-aromatic heterocyclylcarbonyloxy group (e.g., morpholinylcarbonyloxy, piperidinylcarbonyloxy), (18) an optionally halogenated C₁₋₆ alkylsulfonyloxy group (e.g., methylsulfonyloxy, trifluoromethylsulfonyloxy), (19) a C₆₋₁₄ arylsulfonyloxy group optionally substituted by a C₁-C₆ alkyl group (e.g., phenylsulfonyloxy, toluenesulfonyloxy), (20) an optionally halogenated C₁₋₆ alkylthio group, (21) a 5- to 14-membered aromatic heterocyclic group, (22) a 3- to 14-membered non-aromatic heterocyclic group, (23) a formyl group, (24) a carboxy group, (25) an optionally halogenated C₁₋₅ alkyl-carbonyl group, (26) a C₆₋₁₄ aryl-carbonyl group, (27) a 5- to 14-membered aromatic heterocyclylcarbonyl group, (28) a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, (29) a C₁₋₆ alkoxy-carbonyl group, (30) a C₆₋₁₄ aryloxy-carbonyl group (e.g., phenyloxycarbonyl, 1-naphthyloxycarbonyl, 2-naphthyloxycarbonyl), (31) a C₇₋₁₆ aralkyloxy-carbonyl group (e.g., benzyloxycarbonyl, phenethyloxycarbonyl), (32) a carbamoyl group, (33) a thiocarbamoyl group, (34) a mono- or di-C₁₋₆ alkyl-carbamoyl group, (35) a C₆₋₁₄ aryl-carbamoyl group (e.g., phenylcarbamoyl), (36) a 5- to 14-membered aromatic heterocyclylcarbamoyl group (e.g., pyridylcarbamoyl, thienylcarbamoyl), (37) a 3- to 14-membered non-aromatic heterocyclylcarbamoyl group (e.g., morpholinylcarbamoyl, piperidinylcarbamoyl), (38) an optionally halogenated C₁₋₆ alkylsulfonyl group, (39) a C₆₋₁₄ arylsulfonyl group, (40) a 5- to 14-membered aromatic heterocyclylsulfonyl group (e.g., pyridylsulfonyl, thienylsulfonyl), (41) an optionally halogenated C₁₋₆ alkylsulfinyl group, (42) a C₆₋₁₄ arylsulfinyl group (e.g., phenylsulfinyl, 1-naphthylsulfinyl, 2-naphthylsulfinyl), (43) a 5- to 14-membered aromatic heterocyclylsulfinyl group (e.g., pyridylsulfinyl, thienylsulfinyl), (44) an amino group, (45) a mono- or di-C₁₋₆ alkylamino group (e.g., methylamino, ethylamino, propylamino, isopropylamino, butylamino, dimethylamino, diethylamino, dipropylamino, dibutylamino, N-ethyl-N-methylamino), (46) a mono- or di-C₆₋₁₄ arylamino group (e.g., phenylamino), (47) a 5- to 14-membered aromatic heterocyclylamino group (e.g., pyridylamino), (48) a C₇₋₁₆ aralkylamino group (e.g., benzylamino), (49) a formylamino group, (50) a C₁₋₆ alkyl-carbonylamino group (e.g., acetylamino, propanoylamino, butanoylamino), (51) a (C₁₋₆ alkyl) (C₁₋₆ alkyl-carbonyl) amino group (e.g., N-acetyl-N-methylamino), (52) a C₆₋₁₄ aryl-carbonylamino group (e.g., phenylcarbonylamino, naphthylcarbonylamino), (53) a C₁₋₆ alkoxy-carbonylamino group (e.g., methoxycarbonylamino, ethoxycarbonylamino, propoxycarbonylamino, butoxycarbonylamino, tert-butoxycarbonylamino), (54) a C₇₋₁₆ aralkyloxy-carbonylamino group (e.g., benzyloxycarbonylamino), (55) a C₁₋₆ alkylsulfonylamino group (e.g., methylsulfonylamino, ethylsulfonylamino), (56) a C₆₋₁₄ arylsulfonylamino group optionally substituted by a C₁₋₆ alkyl group (e.g., phenylsulfonylamino, toluenesulfonylamino), (57) an optionally halogenated C₁₋₆ alkyl group, (58) a C₂₋₆ alkenyl group, (59) a C₂₋₆ alkynyl group, (60) a C₃₋₁₀ cycloalkyl group, (61) a C₃₋₁₀ cycloalkenyl group and (62) a C₆₋₁₄ aryl group.

The number of the above-mentioned substituents in the “optionally substituted hydrocarbon group” is, for example, 1 to 5, preferably 1 to 3. When the number of the substituents is two or more, the respective substituents may be the same or different.

In the present specification, examples of the “heterocyclic group” (including “heterocyclic group” of “optionally substituted heterocyclic group”) include (i) an aromatic heterocyclic group, (ii) a non-aromatic heterocyclic group and (iii) a 7- to 10-membered bridged heterocyclic group, each containing, as a ring-constituting atom besides carbon atom, 1 to 4 hetero atoms selected from a nitrogen atom, a sulfur atom and an oxygen atom.

In the present specification, examples of the “aromatic heterocyclic group” (including “5- to 14-membered aromatic heterocyclic group”) include a 5- to 14-membered (preferably 5-to 10-membered) aromatic heterocyclic group containing, as a ring-constituting atom besides carbon atom, 1 to 4 hetero atoms selected from a nitrogen atom, a sulfur atom and an oxygen atom.

Preferable examples of the “aromatic heterocyclic group” include 5- or 6-membered monocyclic aromatic heterocyclic groups such as thienyl, furyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, 1,2,4-oxadiazolyl, 1,3,4-oxadiazolyl, 1,2,4-thiadiazolyl, 1,3,4-thiadiazolyl, triazolyl, tetrazolyl, triazinyl and the like; and 8- to 14-membered fused polycyclic (preferably bi or tricyclic) aromatic heterocyclic groups such as benzothiophenyl, benzofuranyl, benzimidazolyl, benzoxazolyl, benzisoxazolyl, benzothiazolyl, benzisothiazolyl, benzotriazolyl, imidazopyridinyl, thienopyridinyl, furopyridinyl, pyrrolopyridinyl, pyrazolopyridinyl, oxazolopyridinyl, thiazolopyridinyl, imidazopyrazinyl, imidazopyrimidinyl, thienopyrimidinyl, furopyrimidinyl, pyrrolopyrimidinyl, pyrazolopyrimidinyl, oxazolopyrimidinyl, thiazolopyrimidinyl, pyrazolotriazinyl, naphtho[2,3-b]thienyl, phenoxathiinyl, indolyl, isoindolyl, 1H-indazolyl, purinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, carbazolyl, β-carbolinyl, phenanthridinyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl and the like.

In the present specification, examples of the “non-aromatic heterocyclic group” (including “3- to 14-membered non-aromatic heterocyclic group”) include a 3- to 14-membered (preferably 4- to 10-membered) non-aromatic heterocyclic group containing, as a ring-constituting atom besides carbon atom, 1 to 4 hetero atoms selected from a nitrogen atom, a sulfur atom and an oxygen atom.

Preferable examples of the “non-aromatic heterocyclic group” include 3- to 8-membered monocyclic non-aromatic heterocyclic groups such as aziridinyl, oxiranyl, thiiranyl, azetidinyl, oxetanyl, thietanyl, tetrahydrothienyl, tetrahydrofuranyl, pyrrolinyl, pyrrolidinyl, imidazolinyl, imidazolidinyl, oxazolinyl, oxazolidinyl, pyrazolinyl, pyrazolidinyl, thiazolinyl, thiazolidinyl, tetrahydroisothiazolyl, tetrahydrooxazolyl, tetrahydroisooxazolyl, piperidinyl, piperazinyl, tetrahydropyridinyl, dihydropyridinyl, dihydrothiopyranyl, tetrahydropyrimidinyl, tetrahydropyridazinyl, dihydropyranyl, tetrahydropyranyl, tetrahydrothiopyranyl, morpholinyl, thiomorpholinyl, azepanyl, diazepanyl, azepinyl, oxepanyl, azocanyl, diazocanyl and the like; and 9- to 14-membered fused polycyclic (preferably bi or tricyclic) non-aromatic heterocyclic groups such as dihydrobenzofuranyl, dihydrobenzimidazolyl, dihydrobenzoxazolyl, dihydrobenzothiazolyl, dihydrobenzisothiazolyl, dihydronaphtho[2,3-b]thienyl, tetrahydroisoquinolyl, tetrahydroquinolyl, 4H-quinolizinyl, indolinyl, isoindolinyl, tetrahydrothieno[2,3-c]pyridinyl, tetrahydrobenzazepinyl, tetrahydroquinoxalinyl, tetrahydrophenanthridinyl, hexahydrophenothiazinyl, hexahydrophenoxazinyl, tetrahydrophthalazinyl, tetrahydronaphthyridinyl, tetrahydroquinazolinyl, tetrahydrocinnolinyl, tetrahydrocarbazolyl, tetrahydro-β-carbolinyl, tetrahydroacrydinyl, tetrahydrophenazinyl, tetrahydrothioxanthenyl, octahydroisoquinolyl and the like.

In the present specification, preferable examples of the “7- to 10-membered bridged heterocyclic group” include quinuclidinyl and 7-azabicyclo[2.2.1]heptanyl.

In the present specification, examples of the “nitrogen-containing heterocyclic group” include the “heterocyclic group” containing at least one nitrogen atom as a ring-constituting atom.

In the present specification, examples of the “optionally substituted heterocyclic group” include a heterocyclic group optionally having substituent(s) selected from the aforementioned substituent group A.

The number of the substituents in the “optionally substituted heterocyclic group” is, for example, 1 to 3. When the number of the substituents is two or more, the respective substituents may be the same or different.

In the present specification, examples of the “acyl group” include a formyl group, a carboxy group, a carbamoyl group, a thiocarbamoyl group, a sulfino group, a sulfo group, a sulfamoyl group and a phosphono group, each optionally having “1 or 2 substituents selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₃₋₁₀ cycloalkenyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a 5- to 14-membered aromatic heterocyclic group and a 3- to 14-membered non-aromatic heterocyclic group, each of which optionally has 1 to 3 substituents selected from a halogen atom, an optionally halogenated C₁₋₆ alkoxy group, a hydroxy group, a nitro group, a cyano group, an amino group and a carbamoyl group”.

Examples of the “acyl group” also include a hydrocarbon-sulfonyl group, a heterocyclylsulfonyl group, a hydrocarbon-sulfinyl group and a heterocyclylsulfinyl group.

Here, the hydrocarbon-sulfonyl group means a hydrocarbon group-bonded sulfonyl group, the heterocyclylsulfonyl group means a heterocyclic group-bonded sulfonyl group, the hydrocarbon-sulfinyl group means a hydrocarbon group-bonded sulfinyl group and the heterocyclylsulfinyl group means a heterocyclic group-bonded sulfinyl group.

Preferable examples of the “acyl group” include a formyl group, a carboxy group, a C₁₋₆ alkyl-carbonyl group, a C₂₋₆ alkenyl-carbonyl group (e.g., crotonoyl), a C₃₋₁₀ cycloalkyl-carbonyl group (e.g., cyclobutanecarbonyl, cyclopentanecarbonyl, cyclohexanecarbonyl, cycloheptanecarbonyl), a C₃₋₁₀ cycloalkenyl-carbonyl group (e.g., 2-cyclohexenecarbonyl), a C₆₋₁₄ aryl-carbonyl group, a C₇₋₁₆ aralkyl-carbonyl group, a 5- to 14-membered aromatic heterocyclylcarbonyl group, a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, a C₁₋₆ alkoxy-carbonyl group, a C₆₋₁₄ aryloxy-carbonyl group (e.g., phenyloxycarbonyl, naphthyloxycarbonyl), a C₇₋₁₆ aralkyloxy-carbonyl group (e.g., benzyloxycarbonyl, phenethyloxycarbonyl), a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group, a mono- or di-C₂₋₆ alkenyl-carbamoyl group (e.g., diallylcarbamoyl), a mono- or di-C₃₋₁₀ cycloalkyl-carbamoyl group (e.g., cyclopropylcarbamoyl), a mono- or di-C₆₋₁₄ aryl-carbamoyl group (e.g., phenylcarbamoyl), a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, a 5- to 14-membered aromatic heterocyclylcarbamoyl group (e.g., pyridylcarbamoyl), a thiocarbamoyl group, a mono- or di-C₁₋₆ alkyl-thiocarbamoyl group (e.g., methylthiocarbamoyl, N-ethyl-N-methylthiocarbamoyl), a mono- or di-C₂₋₆ alkenyl-thiocarbamoyl group (e.g., diallylthiocarbamoyl), a mono- or di-C₃₋₁₀ cycloalkyl-thiocarbamoyl group (e.g., cyclopropylthiocarbamoyl, cyclohexylthiocarbamoyl), a mono- or di-C₆₋₁₄ aryl-thiocarbamoyl group (e.g., phenylthiocarbamoyl), a mono- or di-C₇₋₁₆ aralkyl-thiocarbamoyl group (e.g., benzylthiocarbamoyl, phenethylthiocarbamoyl), a 5- to 14-membered aromatic heterocyclylthiocarbamoyl group (e.g., pyridylthiocarbamoyl), a sulfino group, a C₁₋₆ alkylsulfinyl group (e.g., methylsulfinyl, ethylsulfinyl), a sulfo group, a C₁₋₆ alkylsulfonyl group, a C₆₋₁₄ arylsulfonyl group, a phosphono group and a mono- or di-C₁₋₆ alkylphosphono group (e.g., dimethylphosphono, diethylphosphono, diisopropylphosphono, dibutylphosphono).

In the present specification, examples of the “optionally substituted amino group” include an amino group optionally having “1 or 2 substituents selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a C₁₋₆ alkyl-carbonyl group, a C₆₋₁₄ aryl-carbonyl group, a C₇₋₁₆ aralkyl-carbonyl group, a 5- to 14-membered aromatic heterocyclylcarbonyl group, a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, a C₁₋₆ alkoxy-carbonyl group, a 5- to 14-membered aromatic heterocyclic group, a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group, a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, a C₁₋₆ alkylsulfonyl group and a C₆₋₁₄ arylsulfonyl group, each of which optionally has 1 to 3 substituents selected from substituent group A”.

Preferable examples of the optionally substituted amino group include an amino group, a mono- or di-(optionally halogenated C₁₋₆ alkyl)amino group (e.g., methylamino, trifluoromethylamino, dimethylamino, ethylamino, diethylamino, propylamino, dibutylamino), a mono- or di-C₂₋₆ alkenylamino group (e.g., diallylamino), a mono- or di-C₃₋₁₀ cycloalkylamino group (e.g., cyclopropylamino, cyclohexylamino), a mono- or di-C₆₋₁₄ arylamino group (e.g., phenylamino), a mono- or di-C₇₋₁₆ aralkylamino group (e.g., benzylamino, dibenzylamino), a mono- or di-(optionally halogenated C₁₋₆ alkyl)-carbonylamino group (e.g., acetylamino, propionylamino), a mono- or di-C₆₋₁₄ aryl-carbonylamino group (e.g., benzoylamino), a mono- or di-C₇₋₁₆ aralkyl-carbonylamino group (e.g., benzylcarbonylamino), a mono- or di-5- to 14-membered aromatic heterocyclylcarbonylamino group (e.g., nicotinoylamino, isonicotinoylamino), a mono- or di-3- to 14-membered non-aromatic heterocyclylcarbonylamino group (e.g., piperidinylcarbonylamino), a mono- or di-C₁₋₆ alkoxy-carbonylamino group (e.g., tert-butoxycarbonylamino), a 5- to 14-membered aromatic heterocyclylamino group (e.g., pyridylamino), a carbamoylamino group, a (mono- or di-C₁₋₆ alkyl-carbamoyl) amino group (e.g., methylcarbamoylamino), a (mono- or di-C₇₋₁₆ aralkyl-carbamoyl)amino group (e.g., benzylcarbamoylamino), a C₁₋₆ alkylsulfonylamino group (e.g., methylsulfonylamino, ethylsulfonylamino), a C₆₋₁₄ arylsulfonylamino group (e.g., phenylsulfonylamino), a (C₁₋₆ alkyl) (C₁₋₆ alkyl-carbonyl)amino group (e.g., N-acetyl-N-methylamino) and a (C₁₋₆ alkyl) (C₆₋₁₄ aryl-carbonyl)amino group (e.g., N-benzoyl-N-methylamino).

In the present specification, examples of the “optionally substituted carbamoyl group” include a carbamoyl group optionally having “1 or 2 substituents selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a C₁₋₆ alkyl-carbonyl group, a C₆₋₁₄ aryl-carbonyl group, a C₇₋₁₆ aralkyl-carbonyl group, a 5- to 14-membered aromatic heterocyclylcarbonyl group, a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, a C₁₋₆ alkoxy-carbonyl group, a 5- to 14-membered aromatic heterocyclic group, a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group and a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, each of which optionally has 1 to 3 substituents selected from substituent group A”.

Preferable examples of the optionally substituted carbamoyl group include a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group, a mono- or di-C₂₋₆ alkenyl-carbamoyl group (e.g., diallylcarbamoyl), a mono- or di-C₃₋₁₀ cycloalkyl-carbamoyl group (e.g., cyclopropylcarbamoyl, cyclohexylcarbamoyl), a mono- or di-C₆₋₁₄ aryl-carbamoyl group (e.g., phenylcarbamoyl), a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbonyl-carbamoyl group (e.g., acetylcarbamoyl, propionylcarbamoyl), a mono- or di-C₆₋₁₄ aryl-carbonyl-carbamoyl group (e.g., benzylcarbamoyl) and a 5- to 14-membered aromatic heterocyclylcarbamoyl group (e.g., pyridylcarbamoyl).

In the present specification, examples of the “optionally substituted thiocarbamoyl group” include a thiocarbamoyl group optionally having “1 or 2 substituents selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a C₁₋₆ alkyl-carbonyl group, a C₆₋₁₄ aryl-carbonyl group, a C₇₋₁₆ aralkyl-carbonyl group, a 5- to 14-membered aromatic heterocyclylcarbonyl group, a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, a C₁₋₆ alkoxy-carbonyl group, a 5- to 14-membered aromatic heterocyclic group, a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group and a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, each of which optionally has 1 to 3 substituents selected from substituent group A”.

Preferable examples of the optionally substituted thiocarbamoyl group include a thiocarbamoyl group, a mono- or di-C₁₋₆ alkyl-thiocarbamoyl group (e.g., methylthiocarbamoyl, ethylthiocarbamoyl, dimethylthiocarbamoyl, diethylthiocarbamoyl, N-ethyl-N-methylthiocarbamoyl), a mono- or di-C₂₋₆ alkenyl-thiocarbamoyl group (e.g., diallylthiocarbamoyl), a mono- or di-C₃₋₁₀ cycloalkyl-thiocarbamoyl group (e.g., cyclopropylthiocarbamoyl, cyclohexylthiocarbamoyl), a mono- or di-C₆₋₁₄ aryl-thiocarbamoyl group (e.g., phenylthiocarbamoyl), a mono- or di-C₇₋₁₆ aralkyl-thiocarbamoyl group (e.g., benzylthiocarbamoyl, phenethylthiocarbamoyl), a mono- or di-C₁₋₆ alkyl-carbonyl-thiocarbamoyl group (e.g., acetylthiocarbamoyl, propionylthiocarbamoyl), a mono- or di-C₆₋₁₄ aryl-carbonyl-thiocarbamoyl group (e.g., benzylthiocarbamoyl) and a 5- to 14-membered aromatic heterocyclylthiocarbamoyl group (e.g., pyridylthiocarbamoyl).

In the present specification, examples of the “optionally substituted sulfamoyl group” include a sulfamoyl group optionally having “1 or 2 substituents selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a C₁₋₆ alkyl-carbonyl group, a C₆₋₁₄ aryl-carbonyl group, a C₇₋₁₆ aralkyl-carbonyl group, a 5- to 14-membered aromatic heterocyclylcarbonyl group, a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, a C₁₋₆ alkoxy-carbonyl group, a 5- to 14-membered aromatic heterocyclic group, a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group and a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, each of which optionally has 1 to 3 substituents selected from substituent group A”.

Preferable examples of the optionally substituted sulfamoyl group include a sulfamoyl group, a mono- or di-C₁₋₆ alkyl-sulfamoyl group (e.g., methylsulfamoyl, ethylsulfamoyl, dimethylsulfamoyl, diethylsulfamoyl, N-ethyl-N-methylsulfamoyl), a mono- or di-C₂₋₆ alkenyl-sulfamoyl group (e.g., diallylsulfamoyl), a mono- or di-C₃₋₁₀ cycloalkyl-sulfamoyl group (e.g., cyclopropylsulfamoyl, cyclohexylsulfamoyl), a mono- or di-C₆₋₁₄ aryl-sulfamoyl group (e.g., phenylsulfamoyl), a mono- or di-C₇₋₁₆ aralkyl-sulfamoyl group (e.g., benzylsulfamoyl, phenethylsulfamoyl), a mono- or di-C₁₋₆ alkyl-carbonyl-sulfamoyl group (e.g., acetylsulfamoyl, propionylsulfamoyl), a mono- or di-C₆₋₁₄ aryl-carbonyl-sulfamoyl group (e.g., benzoylsulfamoyl) and a 5- to 14-membered aromatic heterocyclylsulfamoyl group (e.g., pyridylsulfamoyl).

In the present specification, examples of the “optionally substituted hydroxy group” include a hydroxyl group optionally having “a substituent selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a C₁₋₆ alkyl-carbonyl group, a C₆₋₁₄ aryl-carbonyl group, a C₇₋₁₆ aralkyl-carbonyl group, a 5- to 14-membered aromatic heterocyclylcarbonyl group, a 3- to 14-membered non-aromatic heterocyclylcarbonyl group, a C₁₋₆ alkoxy-carbonyl group, a 5- to 14-membered aromatic heterocyclic group, a carbamoyl group, a mono- or di-C₁₋₆ alkyl-carbamoyl group, a mono- or di-C₇₋₁₆ aralkyl-carbamoyl group, a C₁₋₆ alkylsulfonyl group and a C₆₋₁₄ arylsulfonyl group, each of which optionally has 1 to 3 substituents selected from substituent group A”.

Preferable examples of the optionally substituted hydroxy group include a hydroxy group, a C₁₋₆ alkoxy group, a C₂₋₆ alkenyloxy group (e.g., allyloxy, 2-butenyloxy, 2-pentenyloxy, 3-hexenyloxy), a C₃₋₁₀ cycloalkyloxy group (e.g., cyclohexyloxy), a C₆₋₁₄ aryloxy group (e.g., phenoxy, naphthyloxy), a C₇₋₁₆ aralkyloxy group (e.g., benzyloxy, phenethyloxy), a C₁₋₆ alkyl-carbonyloxy group (e.g., acetyloxy, propionyloxy, butyryloxy, isobutyryloxy, pivaloyloxy), a C₆₋₁₄ aryl-carbonyloxy group (e.g., benzoyloxy), a C₇₋₁₆ aralkyl-carbonyloxy group (e.g., benzylcarbonyloxy), a 5- to 14-membered aromatic heterocyclylcarbonyloxy group (e.g., nicotinoyloxy), a 3- to 14-membered non-aromatic heterocyclylcarbonyloxy group (e.g., piperidinylcarbonyloxy), a C₁₋₆ alkoxy-carbonyloxy group (e.g., tert-butoxycarbonyloxy), a 5- to 14-membered aromatic heterocyclyloxy group (e.g., pyridyloxy), a carbamoyloxy group, a C₁₋₆ alkyl-carbamoyloxy group (e.g., methylcarbamoyloxy), a C₇₋₁₆ aralkyl-carbamoyloxy group (e.g., benzylcarbamoyloxy), a C₁₋₆ alkylsulfonyloxy group (e.g., methylsulfonyloxy, ethylsulfonyloxy) and a C₆₋₁₄ arylsulfonyloxy group (e.g., phenylsulfonyloxy).

In the present specification, examples of the “optionally substituted sulfanyl group” include a sulfanyl group optionally having “a substituent selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group, a C₇₋₁₆ aralkyl group, a C₁₋₆ alkyl-carbonyl group, a C₆₋₁₄ aryl-carbonyl group and a 5- to 14-membered aromatic heterocyclic group, each of which optionally has 1 to 3 substituents selected from substituent group A” and a halogenated sulfanyl group.

Preferable examples of the optionally substituted sulfanyl group include a sulfanyl (—SH) group, a C₁₋₆ alkylthio group, a C₂₋₆ alkenylthio group (e.g., alkylthio, 2-butenylthio, 2-pentenylthio, 3-hexenylthio), a C₃₋₁₀ cycloalkylthio group (e.g., cyclohexylthio), a C₆₋₁₄ arylthio group (e.g., phenylthio, naphthylthio), a C₇₋₁₆ aralkylthio group (e.g., benzylthio, phenethylthio), a C₁₋₆ alkyl-carbonylthio group (e.g., acetylthio, propionylthio, butyrylthio, isobutyrylthio, pivaloylthio), a C₆₋₁₄ aryl-carbonylthio group (e.g., benzoylthio), a 5- to 14-membered aromatic heterocyclylthio group (e.g., pyridylthio) and a halogenated thio group (e.g., pentafluorothio).

In the present specification, examples of the “optionally substituted silyl group” include a silyl group optionally having “1 to 3 substituents selected from a C₁₋₆ alkyl group, a C₂₋₆ alkenyl group, a C₃₋₁₀ cycloalkyl group, a C₆₋₁₄ aryl group and a C₇₋₁₆ aralkyl group, each of which optionally has 1 to 3 substituents selected from substituent group A”.

Preferable examples of the optionally substituted silyl group include a tri-C₁₋₆ alkylsilyl group (e.g., trimethylsilyl, tert-butyl(dimethyl)silyl).

In the present specification, examples of the “hydrocarbon ring” include a C₆₋₁₄ aromatic hydrocarbon ring, C₃₋₁₀ cycloalkane and C₃₋₁₀ cycloalkene.

In the present specification, examples of the “C₆₋₁₄ aromatic hydrocarbon ring” include benzene and naphthalene.

In the present specification, examples of the “C₃₋₁₀ cycloalkane” include cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane and cyclooctane.

In the present specification, examples of the “C₃₋₁₀ cycloalkene” include cyclopropene, cyclobutene, cyclopentene, cyclohexene, cycloheptene and cyclooctene.

In the present specification, examples of the “heterocycle” include an aromatic heterocycle and a non-aromatic heterocycle, each containing, as a ring-constituting atom besides carbon atom, 1 to 4 hetero atoms selected from a nitrogen atom, a sulfur atom and an oxygen atom.

In the present specification, examples of the “aromatic heterocycle” include a 5- to 14-membered (preferably 5- to 10-membered) aromatic heterocycle containing, as a ring-constituting atom besides carbon atom, 1 to 4 hetero atoms selected from a nitrogen atom, a sulfur atom and an oxygen atom. Preferable examples of the “aromatic heterocycle” include 5- or 6-membered monocyclic aromatic heterocycles such as thiophene, furan, pyrrole, imidazole, pyrazole, thiazole, isothiazole, oxazole, isoxazole, pyridine, pyrazine, pyrimidine, pyridazine, 1,2,4-oxadiazole, 1,3,4-oxadiazole, 1,2,4-thiadiazole, 1,3,4-thiadiazole, triazole, tetrazole, triazine and the like; and 8- to 14-membered fused polycyclic (preferably bi or tricyclic) aromatic heterocycles such as benzothiophene, benzofuran, benzimidazole, benzoxazole, benzisoxazole, benzothiazole, benzisothiazole, benzotriazole, imidazopyridine, thienopyridine, furopyridine, pyrrolopyridine, pyrazolopyridine, oxazolopyridine, thiazolopyridine, imidazopyrazine, imidazopyrimidine, thienopyrimidine, furopyrimidine, pyrrolopyrimidine, pyrazolopyrimidine, oxazolopyrimidine, thiazolopyrimidine, pyrazolopyrimidine, pyrazolotriazine, naphtho[2,3-b]thiophene, phenoxathiin, indole, isoindole, 1H-indazole, purine, isoquinoline, quinoline, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, carbazole, β-carboline, phenanthridine, acridine, phenazine, phenothiazine, phenoxazine and the like.

In the present specification, examples of the “non-aromatic heterocycle” include a 3- to 14-membered (preferably 4- to 10-membered) non-aromatic heterocycle containing, as a ring-constituting atom besides carbon atom, 1 to 4 hetero atoms selected from a nitrogen atom, a sulfur atom and an oxygen atom. Preferable examples of the “non-aromatic heterocycle” include 3- to 8-membered monocyclic non-aromatic heterocycles such as aziridine, oxirane, thiirane, azetidine, oxetane, thietane, tetrahydrothiophene, tetrahydrofuran, pyrroline, pyrrolidine, imidazoline, imidazolidine, oxazoline, oxazolidine, pyrazoline, pyrazolidine, thiazoline, thiazolidine, tetrahydroisothiazole, tetrahydrooxazole, tetrahydroisoxazole, piperidine, piperazine, tetrahydropyridine, dihydropyridine, dihydrothiopyran, tetrahydropyrimidine, tetrahydropyridazine, dihydropyran, tetrahydropyran, tetrahydrothiopyran, morpholine, thiomorpholine, azepanine, diazepane, azepine, azocane, diazocane, oxepane and the like; and 9- to 14-membered fused polycyclic (preferably bi or tricyclic) non-aromatic heterocycles such as dihydrobenzofuran, dihydrobenzimidazole, dihydrobenzoxazole, dihydrobenzothiazole, dihydrobenzisothiazole, dihydronaphtho[2,3-b]thiophene, tetrahydroisoquinoline, tetrahydroquinoline, 4H-quinolizine, indoline, isoindoline, tetrahydrothieno[2,3-c]pyridine, tetrahydrobenzazepine, tetrahydroquinoxaline, tetrahydrophenanthridine, hexahydrophenothiazine, hexahydrophenoxazine, tetrahydrophthalazine, tetrahydronaphthyridine, tetrahydroquinazoline, tetrahydrocinnoline, tetrahydrocarbazole, tetrahydro-β-carboline, tetrahydroacridine, tetrahydrophenazine, tetrahydrothioxanthene, octahydroisoquinoline and the like.

In the present specification, examples of the “nitrogen-containing heterocycle” include the “heterocycle” containing at least one nitrogen atom as a ring-constituting atom.

In the present specification, examples of the “5- or 6-membered ring” of the “optionally substituted 5- or 6-membered ring” include the above-mentioned “hydrocarbon ring” having 5 or 6 carbon atoms, and the above-mentioned 5- or 6-membered “heterocycle”. As the substituent thereof, the above-mentioned “substituent” can be mentioned.

Each symbol in the formula (I) is explained below.

R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms.

Examples of the “C₁₋₆ alkyl group” of the “C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms” for R include ethyl, n-propyl, n-butyl, and isobutyl. The “C₁₋₆ alkyl group” has 1 to 5 (preferably 1 to 3) halogen atoms (e.g., fluorine atom) at substitutable position(s). When a plurality of halogen atoms are present, the halogen atoms may be the same or different. The “halogen atom” is preferably a fluorine atom.

R is preferably ethyl, n-propyl, n-butyl or isobutyl substituted by 1 to 5 fluorine atoms.

Ring A is an optionally substituted 5- or 6-membered ring.

Examples of the “5- or 6-membered ring” of the “optionally substituted 5- or 6-membered ring” for ring A include a benzene ring, C₅₋₆ cycloalkane, C₅₋₆ cycloalkene, a 5- or 6-membered monocyclic aromatic heterocycle, a 5- or 6-membered monocyclic non-aromatic heterocycle and the like.

As the “C₅₋₆ cycloalkane” exemplified as the aforementioned “5- or 6-membered ring”, cyclopentane and cyclohexane can be mentioned.

As the “C₅₋₆ cycloalkene” exemplified as the aforementioned “5- or 6-membered ring”, cyclopentene and cyclohexene can be mentioned.

As the “5- or 6-membered monocyclic aromatic heterocycle” exemplified as the aforementioned “5- or 6-membered ring”, the above-mentioned “5- or 6-membered monocyclic aromatic heterocycle” can be mentioned.

As the “5- or 6-membered monocyclic non-aromatic heterocycle” exemplified as the aforementioned “5- or 6-membered ring”, 5- or 6-membered ones from the above-mentioned “3- to 8-membered monocyclic non-aromatic heterocycle” can be mentioned.

As ring A, a benzene ring, a 5- or 6-membered monocyclic non-aromatic heterocycle (e.g., piperidine ring) or a 5- or 6-membered monocyclic aromatic heterocycle (e.g., thiophene ring, pyrazole ring) is preferable.

The “5- or 6-membered ring” of the “optionally substituted 5- or 6-membered ring” for ring A optionally has 1 to 5 (preferably 1 to 3) substituent(s) at substitutable position(s). Examples of such substituent include substituents selected from the above-mentioned “substituent group A”. When a plurality of substituents are present, the substituents may be the same or different.

As the “substituent” of the “optionally substituted 5- or 6-membered ring” for ring A,

(1) a halogen atom (e.g., fluorine atom, bromine atom), (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), (3) a 5- to 14-membered aromatic heterocyclic group (preferably, 5- or 6-membered monocyclic aromatic heterocyclic group) (e.g., pyrrolyl, pyrazolyl, triazolyl, furyl, isothiazolyl, pyridyl, pyridazinyl, indazolyl) optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom), and

(b) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl),

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group (e.g., tert-butoxycarbonyl), (6) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl), (7) a 3- to 8-membered monocyclic nonaromatic heterocyclic group (e.g., tetrahydrofuranyl), (8) a C₇₋₁₆ aralkyl group (e.g., benzyl), or (9) a carbamoyl group is preferable, (1) a halogen atom (e.g., fluorine atom), (2) a mono-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), or (3) (i) pyrazolyl, (ii) triazolyl, (iii) isothiazolyl, (iv) pyridyl, or (v) indazolyl, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom) is more preferable, and

pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl, ethyl)

is particularly preferable.

Ring A is

preferably a benzene ring, a 5- or 6-membered monocyclic non-aromatic heterocycle (e.g., piperidine ring) or a 5- or 6-membered monocyclic aromatic heterocycle (e.g., thiophene ring, pyrazole ring), each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom), (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), (3) a 5- to 14-membered aromatic heterocyclic group (preferably, 5- or 6-membered monocyclic aromatic heterocyclic group) (e.g., pyrrolyl, pyrazolyl, triazolyl, furyl, isothiazolyl, pyridyl, pyridazinyl, indazolyl) optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom), and

(b) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl),

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group (e.g., tert-butoxycarbonyl), (6) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl), (7) a 3- to 8-membered monocyclic nonaromatic heterocyclic group (e.g., tetrahydrofuranyl), (8) a C₇₋₁₆ aralkyl group (e.g., benzyl), and (9) a carbamoyl group;

more preferably, a benzene ring, a 5- or 6-membered monocyclic non-aromatic heterocycle (e.g., piperidine ring) or a 5- or 6-membered monocyclic aromatic heterocycle (e.g., thiophene ring, pyrazole ring), each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom), (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), (3) a 5- or 6-membered monocyclic aromatic heterocyclic group (e.g., pyrrolyl, pyrazolyl, triazolyl, furyl, isothiazolyl, pyridyl, pyridazinyl) optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted 1 to 3 halogen atoms (e.g., fluorine atom), and

(b) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl),

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group (e.g., tert-butoxycarbonyl), (6) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl), (7) a 3- to 8-membered monocyclic nonaromatic heterocyclic group (e.g., tetrahydrofuranyl), (8) a C₇₋₁₆ aralkyl group (e.g., benzyl), and (9) a carbamoyl group;

further preferably, a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom), (2) a mono-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), and (3) (i) pyrazolyl, (ii) triazolyl, (iii) isothiazolyl, (iv) pyridyl or (v) indazolyl, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom);

still more preferably, a benzene ring substituted by

(1) one halogen atom (e.g., fluorine atom), and/or (2) one pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl, ethyl);

particularly preferably, a benzene ring substituted by one pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl, ethyl).

X is —CH═ or —N═.

As preferable embodiments of compound (I), the following compounds can be mentioned.

[Compound A-1]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl, n-propyl, n-butyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring, a 5- or 6-membered monocyclic non-aromatic heterocycle (e.g., piperidine ring) or a 5- or 6-membered monocyclic aromatic heterocycle (e.g., thiophene ring, pyrazole ring), each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom, bromine atom), (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), (3) a 5- to 14-membered aromatic heterocyclic group (preferably, 5- or 6-membered monocyclic aromatic heterocyclic group) (e.g., pyrrolyl, pyrazolyl, triazolyl, furyl, isothiazolyl, pyridyl, pyridazinyl, indazolyl) optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom), and

(b) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl),

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group (e.g., tert-butoxycarbonyl), (6) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl), (7) a 3- to 8-membered monocyclic nonaromatic heterocyclic group (e.g., tetrahydrofuranyl), (8) a C₇₋₁₆ aralkyl group (e.g., benzyl), and (9) a carbamoyl group; and

X is —CH═ or —N═.

[Compound A-2]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl, n-propyl, n-butyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring, a piperidine ring, a thiophene ring or a pyrazole ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom, bromine atom), (2) a mono-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), (3) pyrrolyl, pyrazolyl, triazolyl, furyl, isothiazolyl, pyridyl, pyridazinyl or indazolyl, each of which is optionally substituted by 1 to 3 substituents selected from

(a) a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom), and

(b) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl),

(4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group (e.g., tert-butoxycarbonyl), (6) a C₃₋₆ cycloalkyl group (e.g., cyclopropyl), (7) a 3- to 8-membered monocyclic nonaromatic heterocyclic group (e.g., tetrahydrofuranyl), (8) a C₇₋₁₆ aralkyl group (e.g., benzyl), and (9) a carbamoyl group; and

X is —CH═ or —N═.

[Compound A-3]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl, n-propyl, n-butyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom), (2) a mono-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), and (3) (i) pyrazolyl, (ii) triazolyl, (iii) isothiazolyl, (iv) pyridyl or (v) indazolyl, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom); and

X is —CH═ or —N═.

[Compound A-4]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl, n-propyl, n-butyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom), (2) a mono-C₁₋₆ alkyl-carbamoyl group (e.g., methylcarbamoyl), and (3) (i) pyrazolyl or (ii) pyridyl, each of which is substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom); and

X is —CH═ or —N═.

[Compound A-5]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl, n-propyl, n-butyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from

(1) a halogen atom (e.g., fluorine atom), and (2) (i) pyrazolyl, (ii) triazolyl, (iii) isothiazolyl or (iv) indazolyl, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group (e.g., methyl, ethyl) optionally substituted by 1 to 3 halogen atoms (e.g., fluorine atom); and

X is —CH═ or —N═.

[Compound A-6]

Compound (I) wherein R is a C₁₋₅ alkyl group (e.g., ethyl, n-propyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring substituted by

(1) one halogen atom (e.g., fluorine atom), and/or (2) one pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl, ethyl); and

X is —CH═ or —N═.

[Compound A-7]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., n-propyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring substituted by

(1) one halogen atom (e.g., fluorine atom), and/or (2) one pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl, ethyl); and

X is —N═.

[Compound A-8]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl, n-propyl, n-butyl, isobutyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring substituted by one pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl, ethyl); and

X is —CH═ or —N═.

[Compound A-9]

Compound (I) wherein R is a C₁₋₆ alkyl group (e.g., ethyl) substituted by 1 to 5 halogen atoms (e.g., fluorine atom);

ring A is a benzene ring substituted by one pyrazolyl substituted by 1 to 3 C₁₋₆ alkyl groups (e.g., methyl); and

X is —CH═.

Preferable specific examples of a compound represented by the formula (I) include the compounds of Examples 1-90 and 92-118, of which

-   4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   4-(2,2-difluoroethoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   4-(2,2-difluoroethoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-4-(2-fluoro-2-methylpropoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   4-(2,2-difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluorobutoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluorobutoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   6-(2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)benzyl)-4-(2,2,2-trifluoroethoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   4-((4-(2,2-difluorobutoxy)-5-oxo-5,7-dihydro-6H-pyrrolo[3,4-d]pyrimidin-6-yl)methyl)-N-methylbenzamide, -   6-(4-(2-methylpyridin-4-yl)benzyl)-4-(2,2,2-trifluoroethoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   4-(2,2-difluoropropoxy)-2-(4-(1-(2,2,2-trifluoroethyl)-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   2-(4-(1-(2,2-difluoroethyl)-1H-pyrazol-4-yl)benzyl)-4-(2,2-difluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluoropropoxy)-2-(4-(2-methyl-2H-indazol-5-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluoroethoxy)-6-((5-(1,3-dimethyl-1H-pyrazol-4-yl)-3-fluoro-2-thienyl)methyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one, -   2-(2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)benzyl)-4-(3,3,3-trifluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   2-(4-(1-cyclopropyl-1H-pyrazol-4-yl)benzyl)-4-(2,2-difluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   s     2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-4-(2,2,3,3-tetrafluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluoropropoxy)-2-(2-fluoro-4-(3-furyl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluoropropoxy)-2-(4-(1,2-thiazol-5-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluoropropoxy)-2-(2-fluoro-4-(3-furyl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one, -   4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one,     and -   4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     is preferable, -   4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     (Example 1), -   6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-4-(2-fluoro-2-methylpropoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     (Example 5), -   4-(2,2-difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one     (Example 6), -   4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     (Example 22), and -   4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     (Example 23) -   are more preferable, and -   4-(2,2-difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one     (Example 6), -   4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     (Example 22), and -   4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one     (Example 23)     are particularly preferable.

When compound (I) is in the form of a salt, examples of such salt include salts with inorganic base, an ammonium salt, salts with organic base, salts with inorganic acid, salts with organic acid, salts with basic or acidic amino acid, and the like.

Preferable examples of the salt with inorganic base include alkali metal salts such as sodium salt, potassium salt and the like; alkaline earth metal salts such as calcium salt, magnesium salt, barium salt and the like; an aluminum salt, and the like.

Preferable examples of the salt with organic base include salts with trimethylamine, triethylamine, pyridine, picoline, ethanolamine, diethanolamine, triethanolamine, dicyclohexylamine, N,N′-dibenzylethylenediamine and the like.

Preferable examples of the salt with inorganic acid include salts with hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid and the like.

Preferable examples of the salt with organic acid include salts with formic acid, acetic acid, trifluoroacetic acid, fumaric acid, oxalic acid, tartaric acid, maleic acid, citric acid, succinic acid, malic acid, methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid and the like.

Preferable examples of the salt with basic amino acid include salts with arginine, lysine, ornithine and the like.

Preferable examples of the salt with acidic amino acid include salts with aspartic acid, glutamic acid and the like.

Among these salts, a pharmaceutically acceptable salt is preferable. When a compound has a basic functional group, examples of a preferable pharmaceutically acceptable salt include salts with inorganic acid such as hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid and the like, and salts with organic acid such as acetic acid, phthalic acid, fumaric acid, oxalic acid, tartaric acid, maleic acid, citric acid, succinic acid, methanesulfonic acid, p-toluenesulfonic acid and the like. In addition, when a compound has an acidic functional group, examples thereof include inorganic salts such as alkali metal salts (e.g., sodium salt, potassium salt etc.), alkaline earth metal salts (e.g., calcium salt, magnesium salt, barium salt etc.) and the like, ammonium salt and the like.

Compound (I) may be a crystal, and both a single crystal and crystal mixtures are encompassed in the compound (I).

Compound (I) may be a pharmaceutically acceptable cocrystal or cocrystal salt. Here, the cocrystal or cocrystal salt means a crystalline substance consisting of two or more particular substances which are solids at room temperature, each having different physical properties (e.g., structure, melting point, heat of melting, hygroscopicity, solubility, stability etc.). The cocrystal and cocrystal salt can be produced by cocrystallization method known per se.

Compound (I) encompasses solvates (e.g., hydrate) and non-solvates within the scope thereof. compound (I) may be a compound labeled or substituted with an isotope (e.g., ²H, ³H, ¹¹C, ¹⁴C, ¹⁸F, ³⁵S, ¹²⁵I). A compound labeled with or substituted by an isotope can be used, for example, as a tracer used for Positron Emission Tomography (PET) (PET tracer), and is useful in the field of medical diagnosis and the like.

When compound (I) of the present invention has an asymmetric center, isomers such as enantiomer, diastereomer and the like may be present. Such isomers and a mixture thereof are all encompassed within the scope of the present invention. When an isomer is formed due to the conformation or tautomerism, such isomers and a mixture thereof are also encompassed in compound (I) of the present invention.

The production method of the compound of the present invention is explained in the following.

The starting materials and reagents used in each step in the following production method, and the obtained compounds each may form a salt. Examples of the salt include those similar to the aforementioned salts of the compound of the present invention and the like.

When the compound obtained in each step is a free compound, it can be converted to a desired salt by a method known per se. Conversely, when the compound obtained in each step is a salt, it can be converted to a free form or a desired other kind of salt by a method known per se.

The compound obtained in each step can also be used for the next reaction as a reaction mixture thereof or after obtaining a crude product thereof. Alternatively, the compound obtained in each step can be isolated and/or purified from the reaction mixture by a separation means such as concentration, crystallization, recrystallization, distillation, solvent extraction, fractionation, chromatography and the like according to a conventional method.

When the starting materials and reagent compounds of each step are commercially available, the commercially available products can be used as they are.

In the reaction of each step, while the reaction time varies depending on the reagents and solvents to be used, unless otherwise specified, it is generally 1 min-48 hr, preferably 10 min-8 hr.

In the reaction of each step, while the reaction temperature varies depending on the reagents and solvents to be used, unless otherwise specified, it is generally −78° C. to 300° C., preferably −78° C. to 150° C.

In the reaction of each step, while the pressure varies depending on the reagents and solvents to be used, unless otherwise specified, it is generally 1 atm-20 atm, preferably 1 atm-3 atm.

In the reaction of each step, for example, microwave synthesizers such as Initiator manufactured by Biotage and the like are sometimes used. While the reaction temperature varies depending on the reagents and solvents to be used, unless otherwise specified, it is generally room temperature-300° C., preferably 50° C.-250° C. While the reaction time varies depending on the reagents and solvents to be used, unless otherwise specified, it is generally 1 min-48 hr, preferably 1 min-8 hr.

In the reaction of each step, unless otherwise specified, a reagent is used in 0.5 equivalent-20 equivalents, preferably 0.8 equivalent-5 equivalents, relative to the substrate. When a reagent is used as a catalyst, the reagent is used in 0.001 equivalent-1 equivalent, preferably 0.01 equivalent-0.2 equivalent, relative to the substrate. When the reagent is also a reaction solvent, the reagent is used in a solvent amount.

In the reaction of each step, unless otherwise specified, it is performed without solvent or by dissolving or suspending in a suitable solvent. Specific examples of the solvent include those described in Examples and the following.

alcohols: methanol, ethanol, tert-butyl alcohol, 2-methoxyethanol and the like; ethers: diethyl ether, diphenyl ether, tetrahydrofuran, 1,2-dimethoxyethane and the like; aromatic hydrocarbons: chlorobenzene, toluene, xylene and the like; saturated hydrocarbons: cyclohexane, hexane and the like; amides: N,N-dimethylformamide, N-methylpyrrolidone and the like; halogenated hydrocarbons: dichloromethane, carbon tetrachloride and the like; nitriles: acetonitrile and the like; sulfoxides: dimethyl sulfoxide and the like; aromatic organic bases: pyridine and the like; acid anhydrides: acetic anhydride and the like; organic acids: formic acid, acetic acid, trifluoroacetic acid and the like; inorganic acids: hydrochloric acid, sulfuric acid and the like; esters: ethyl acetate and the like; ketones: acetone, methyl ethyl ketone and the like; and water.

Two or more kinds of the above-mentioned solvents may be used by mixing at an appropriate ratio.

When a base is used in the reaction of each step, for example, bases shown below or those described in Examples are used.

inorganic bases: sodium hydroxide, magnesium hydroxide and the like; basic salts: sodium carbonate, calcium carbonate, sodium hydrogen carbonate and the like; organic bases: triethylamine, diethylamine, pyridine, 4-dimethylaminopyridine, N,N-dimethylaniline, 1,4-diazabicyclo[2.2.2]octane, 1,8-diazabicyclo[5.4.0]-7-undecene, imidazole, piperidine and the like; metal alkoxides: sodium ethoxide, potassium tert-butoxide and the like; alkali metal hydrides: sodium hydride and the like; metal amides: sodium amide, lithium diisopropyl amide, lithium hexamethyl disilazide and the like; and organic lithiums: n-butyllithium and the like.

When an acid or acidic catalyst is used in the reaction of each step, for example, acids and acidic catalysts shown below or those described in Examples are used.

inorganic acids: hydrochloric acid, sulfuric acid, nitric acid, hydrobromic acid, phosphoric acid and the like; organic acids: acetic acid, trifluoroacetic acid, citric acid, p-toluenesulfonic acid, 10-camphorsulfonic acid and the like; and Lewis acids: boron trifluoride diethyl ether complex, zinc iodide, anhydrous aluminum chloride, anhydrous zinc chloride, anhydrous iron chloride and the like.

Unless otherwise specified, the reaction of each step is performed according to a method known per se, for example, the methods described in Jikken Kagaku Kouza 5th edition, vol. 13-vol. 19 (The Chemical Society of Japan ed.); Shinjikken Kagaku Kouza (Courses in Experimental Chemistry), vol. 14-vol. 15 (The Chemical Society of Japan ed.); Fine Organic Chemistry rev. 2nd edition (L. F. Tietze, Th. Eicher, NANKODO); rev. Organic Name Reactions, Their Mechanism and Essence (Hideo Togo, Kodansha); ORGANIC SYNTHESES Collective Volume I-VII (John Wiley & Sons Inc); Modern Organic Synthesis in the Laboratory, A Collection of Standard Experimental Procedures (Jie Jack Li, OXFORD UNIVERSITY); Comprehensive Heterocyclic Chemistry III, Vol. 1-Vol. 14 (Elsevier Japan KK); Strategic Applications of Named Reactions in Organic Synthesis (translation supervisor Kiyoshi Tomioka, KAGAKUDOJIN); Comprehensive Organic Transformations (VCH Publishers Inc.), 1989 and the like, or the methods described in the Examples.

In each step, protection or deprotection reaction of a functional group is performed by the method known per se, for example, the methods described in “Protective Groups in Organic Synthesis, 4th Ed.” (Theodora W. Greene, Peter G. M. Wuts) Wiley-Interscience, 2007; “Protecting Groups 3rd Ed.” (P. J. Kocienski) Thieme, 2004 and the like, or the methods described in the Examples.

Examples of the protecting group of the hydroxyl group of alcohol and the like and a phenolic hydroxyl group include ether protecting groups such as methoxymethyl ether, benzyl ether, t-butyldimethylsilyl ether, tetrahydropyranyl ether and the like; carboxylate ester protecting groups such as acetate ester and the like; sulfonate ester protecting groups such as methanesulfonate ester and the like; carbonate ester protecting groups such as t-butylcarbonate and the like, and the like.

Examples of the protecting group of the carbonyl group of aldehyde include acetal protecting groups such as dimethyl acetal and the like; cyclic acetal protecting groups such as cyclic 1,3-dioxane and the like, and the like.

Examples of the protecting group of the carbonyl group of ketone include ketal protecting groups such as dimethyl ketal and the like; cyclic ketal protecting groups such as cyclic 1,3-dioxane and the like; oxime protecting groups such as O-methyloxime and the like; hydrazone protecting groups such as N,N-dimethylhydrazone and the like, and the like.

Examples of the carboxyl protecting group include ester protecting groups such as methyl ester and the like; amide protecting groups such as N,N-dimethylamide and the like, and the like.

Examples of the thiol protecting group include ether protecting groups such as benzyl thioether and the like; ester protecting groups such as thioacetate ester, thiocarbonate, thiocarbamate and the like, and the like.

Examples of the protecting group of an amino group and an aromatic hetero ring such as imidazole, pyrrole, indole and the like include carbamate protecting groups such as benzyl carbamate and the like; amide protecting groups such as acetamide and the like; alkylamine protecting groups such as N-triphenylmethylamine and the like, sulfonamide protecting groups such as methanesulfonamide and the like, and the like.

The protecting group can be removed by a method known per se, for example, a method using acid, base, ultraviolet light, hydrazine, phenylhydrazine, sodium N-methyldithiocarbamate, tetrabutylammonium fluoride, palladium acetate, trialkylsilyl halide (e.g., trimethylsilyl iodide, trimethylsilyl bromide), a reduction method and the like.

When a reduction reaction is performed in each step, examples of the reducing agent to be used include metal hydrides such as lithium aluminum hydride, sodium triacetoxyborohydride, sodium cyanoborohydride, diisobutylaluminum hydride (DIBAL-H), sodium borohydride, tetramethylammonium triacetoxyborohydride and the like; boranes such as borane tetrahydrofuran complex and the like; Raney nickel; Raney cobalt; hydrogen; formic acid; triethylsilane and the like. When a carbon-carbon double bond or triple bond is reduced, a method using a catalyst such as palladium-carbon, Lindlar catalyst and the like is used.

When an oxidation reaction is performed in each step, examples of an oxidant to be used include peracids such as m-chloroperbenzoic acid (mCPBA), hydrogen peroxide, t-butyl hydroperoxide and the like; perchlorates such as tetrabutylammonium perchlorate and the like; chlorates such as sodium chlorate and the like; chlorites such as sodium chlorite and the like; periodic acids such as sodium periodate and the like; high valent iodine reagents such as iodosylbenzene and the like; reagents containing manganese such as manganese dioxide, potassium permanganate and the like; leads such as lead tetraacetate and the like; reagents containing chrome such as pyridinium chlorochromate (PCC), pyridinium dichromate (PDC), Jones reagent and the like; halogen compounds such as N-bromosuccinimide (NBS) and the like; oxygen; ozone; sulfur trioxide pyridine complex; osmium tetraoxide; selenium dioxide; 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and the like.

When a radical cyclization reaction is performed in each step, examples of the radical initiator to be used include azo compounds such as azobisisobutyronitrile (AIBN) and the like; water-soluble radical initiators such as 4,4′-azobis-4-cyanopentanoic acid (ACPA) and the like; triethylboron in the presence of air or oxygen; benzoyl peroxide and the like. In addition, examples of the radical reaction agent to be used include tributylstannane, tristrimethylsilylsilane, 1,1,2,2-tetraphenyldisilane, diphenylsilane, samarium iodide and the like.

When the Wittig reaction is performed in each step, examples of the Wittig reagent to be used include alkylidenephosphoranes and the like. Alkylidenephosphoranes can be prepared by a method known per se, for example, by reacting a phosphonium salt with a strong base.

When the Horner-Emmons reaction is performed in each step, examples of the reagent to be used include phosphonoacetic acid esters such as methyl dimethylphosphonoacetate, ethyl diethylphosphonoacetate and the like; and bases such as alkali metal hydrides, organic lithiums and the like.

When the Friedel-Crafts reaction is performed in each step, examples of the reagent to be used include a combination of Lewis acid and acid chloride, a combination of Lewis acid and alkylating agents (e.g., alkyl halides, alcohol, olefins and the like). Alternatively, an organic acid and an inorganic acid can also be used instead of the Lewis acid, and acid anhydride such as acetic anhydride and the like can also be used instead of acid chloride.

When an aromatic nucleophilic substitution reaction is performed in each step, a nucleophilic agent (e.g., amines, imidazole and the like) and a base (e.g., basic salts, organic bases and the like) are used as the reagent.

When a nucleophilic addition reaction with carbanion, a nucleophilic 1,4-addition reaction with carbanion (Michael addition reaction) or a nucleophilic substitution reaction with carbanion is performed in each step, examples of the base to be used for developing carbanion include organic lithiums, metal alkoxides, inorganic bases, organic bases and the like.

When the Grignard reaction is performed in each step, examples of the Grignard reagent include aryl magnesium halides such as phenyl magnesium bromide and the like; and alkyl magnesium halides such as methyl magnesium bromide and the like. The Grignard reagent can be prepared by a method known per se, for example, by reacting alkyl halide or aryl halide with metal magnesium in ether or tetrahydrofuran as a solvent.

When the Knoevenagel condensation reaction is performed in each step, an active methylene compound held between two electron-withdrawing groups (e.g., malonic acid, diethyl malonate, malononitrile and the like) and a base (e.g., organic bases, metal alkoxides, inorganic bases) are used as the reagents.

When the Vilsmeier-Haack reaction is performed in each step, phosphoryl chloride and an amide derivative (e.g., N,N-dimethylformamide and the like) are used as the reagents.

When an azidation reaction of alcohols, alkyl halides or sulfonate esters is performed in each step, examples of the azidation agent to be used include diphenylphosphoryl azide (DPPA), trimethylsilyl azide, sodium azide and the like. For example, when alcohols are azidated, a method using diphenylphosphoryl azide and 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU), a method using trimethylsilyl azide and the Lewis acid and the like can be employed.

When a reductive amination reaction is performed in each step, examples of the reducing agent to be used include sodium triacetoxyborohydride, sodium cyanoborohydride, hydrogen, formic acid and the like. When the substrate is an amine compound, examples of the carbonyl compound to be used besides para-formaldehyde include aldehydes such as acetaldehyde and the like, ketones such as cyclohexanone and the like. When the substrate is a carbonyl compound, examples of the amines to be used include primary amines such as ammonia, methylamine and the like; secondary amines such as dimethylamine and the like, and the like.

When the Mitsunobu reaction is performed in each step, azodicarboxylate esters (e.g., diethyl azodicarboxylate (DEAD), diisopropyl azodicarboxylate (DIAD) and the like) and triphenylphosphine are used as the reagents.

When an esterification reaction, amidation reaction or ureation reaction is performed in each step, examples of the reagent to be used include halogenated acyl forms such as acid chloride, acid bromide and the like; and activated carboxylic acids such as acid anhydride, active ester form, sulfuric acid ester form and the like. Examples of the carboxylic acid activator include carbodiimide condensing agents such as 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (WSCD) and the like; triazine condensing agents such as 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride-n-hydrate (DMT-MM) and the like; carbonate ester condensing agents such as 1,1-carbonyldiimidazole (CDI) and the like; diphenylphosphoryl azide (DPPA); benzotriazol-1-yloxy-trisdimethylaminophosphonium salt (BOP reagent); 2-chloro-1-methyl-pyridinium iodide (Mukaiyama reagent); thionyl chloride; lower alkyl haloformates such as ethyl chloroformate and the like; O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU); sulfuric acid; a combination thereof and the like. When a carbodiimide condensing agent is used, additives such as 1-hydroxybenzotriazole (HOBt), N-hydroxysuccinimide (HOSu), dimethylaminopyridine (DMAP) and the like can be further added to the reaction.

When a coupling reaction is performed in each step, examples of the metal catalyst to be used include palladium compounds such as palladium(II) acetate, tetrakis(triphenylphosphine)palladium(0), dichlorobis(triphenylphosphine)palladium(II), dichlorobis(triethylphosphine)palladium(II), tris(dibenzylideneacetone)dipalladium(0), 1,1′-bis(diphenylphosphino)ferrocene palladium(II) chloride, palladium(II) acetate and the like; nickel compounds such as tetrakis(triphenylphosphine)nickel(0) and the like; rhodium compounds such as tris(triphenylphosphine)rhodium(III) chloride and the like; a cobalt compound; copper compounds such as copper oxide, copper(I) iodide and the like; a platinum compound and the like. A base may be further added to the reaction and examples of such base include inorganic bases, basic salts and the like.

When a thiocarbonylation reaction is performed in each step, diphosphorus pentasulfide is representatively used as a thiocarbonylating agent. Besides diphosphorus pentasulfide, a reagent having a 1,3,2,4-dithiadiphosphetane-2,4-disulfide structure such as 2,4-bis(4-methoxyphenyl-1,3,2,4-dithiadiphosphetane-2,4-disulfide (Lawesson reagent) and the like may also be used.

When the Wohl-Ziegler reaction is performed in each step, examples of the halogenating agent to be used include N-iodosuccinimide, N-bromosuccinimide (NBS), N-chlorosuccinimide (NCS), bromine, sulfuryl chloride and the like. Furthermore, the reaction can be accelerated by adding heat, light, radical initiators such as benzoyl peroxide, azobisisobutyronitrile and the like to the reaction.

When a halogenating reaction of a hydroxy group is performed in each step, examples of the halogenating agent to be used include acid halide of hydrohalic acid and inorganic acid; specifically, hydrochloric acid, thionyl chloride, phosphorus oxychloride and the like for chlorination, and 48% hydrobromic acid and the like for bromination. In addition, a method of obtaining a halogenated alkyl form from alcohol by reacting with triphenylphosphine and carbon tetrachloride or carbon tetrabromide, and the like may be used. Alternatively, a method of synthesizing a halogenated alkyl form via a two-step reaction including conversion of alcohol to sulfonic acid ester, and reacting same with lithium bromide, lithium chloride or sodium iodide may also be used.

When the Arbuzov reaction is performed in each step, examples of the reagent to be used include alkyl halides such as ethyl bromoacetate and the like; and phosphites such as triethyl phosphite, tri(isopropyl) phosphite and the like.

When a sulfonic acid esterification reaction is performed in each step, examples of the sulfonylating agent to be used include methanesulfonyl chloride, p-toluenesulfonyl chloride, methanesulfonic anhydride, p-toluenesulfonic anhydride, N-phenylbis(trifluoromethanesulfonimide) and the like.

When hydrolysis reaction is performed in each step, an acid or a base is used as the reagent. In addition, when acid hydrolysis reaction of t-butyl ester is performed, formic acid, triethylsilane and the like are sometimes added to reductively trap the by-produced t-butyl cation.

When a dehydrating reaction is performed in each step, examples of the dehydrating agent to be used include sulfuric acid, phosphorus pentaoxide, phosphorus oxychloride, N,N′-dicyclohexylcarbodiimide, alumina, polyphosphoric acid and the like.

Compound (I) can be produced by the method shown in the following scheme or a method analogous thereto or a method described in the Examples.

wherein Y is a halogen atom, R² is an optionally substituted C₁₋₆ alkyl group, and each of other symbols is as defined above.

Compound (III) can be produced by an aromatic nucleophilic substitution reaction of compound (II) and alcohol represented by formula: R—OH.

Compound (IV) can be produced by a coupling reaction of compound (III) and 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane or tributyl(vinyl)tin.

Compound (V) can be produced by an oxidation reaction of compound (IV).

Compound (I) can be produced by a reductive amination reaction of compound (V) and the corresponding amine.

When compound (I) has an optical isomer, a stereoisomer, a regioisomer or a rotamer, these are also encompassed in compound (I), and can be obtained as a single product according to synthesis and separation methods known per se. For example, when compound (I) contains an optical isomer, an optical isomer resolved from this compound is also encompassed in compound (I).

The optical isomer can be produced according to a method known per se. To be specific, an optically active synthetic intermediate is used, or the final racemate product is subjected to optical resolution according to a conventional method to give an optical isomer.

For example, the method of optical resolution may be a method known per se, such as a fractional recrystallization method, a chiral column method, a diastereomer method etc.

1) Fractional Recrystallization Method

A method wherein a salt with a racemate with an optically active compound (e.g., (+)-mandelic acid, (−)-mandelic acid, (+)-tartaric acid, (−)-tartaric acid, (+)-1-phenethylamine, (−)-1-phenethylamine, cinchonine, (−)-cinchonidine, brucine etc.) is formed, which is separated by a fractional recrystallization method, and if desired, a neutralization step to give a free optical isomer.

2) Chiral Column Method

A method wherein a racemate or a salt thereof is applied to a column for separation of an optical isomer (a chiral column) to allow separation. In the case of a liquid chromatography, for example, a mixture of the optical isomers is applied to a chiral column such as ENANTIO-OVM (manufactured by Tosoh Corporation), CHIRAL series manufactured by Daicel Corporation and the like, and developed with water, various buffers (e.g., phosphate buffer, etc.) and organic solvents (e.g., ethanol, methanol, isopropanol, acetonitrile, trifluoroacetic acid, diethylamine etc.), solely or as a mixed solution thereof to separate the optical isomer.

3) Diastereomer Method

A method wherein a racemic mixture is prepared into a diastereomeric mixture by chemical reaction with an optically active reagent, which is made into a single substance by a typical separation means (e.g., a fractional recrystallization method, a chromatography method etc.) and the like, and is subjected to a chemical treatment such as hydrolysis reaction and the like to remove an optically active reagent moiety, whereby an optical isomer is obtained. For example, when compound (I) contains hydroxy group, or primary or secondary amino group within a molecule, the compound and an optically active organic acid (e.g., MTPA [α-methoxy-α-(trifluoromethyl)phenylacetic acid], (−)-menthoxyacetic acid etc.) and the like are subjected to condensation reaction to give diastereomers of the ester compound or the amide compound, respectively. When compound (I) has a carboxylic acid group, this compound and an optically active amine or an optically active alcohol reagent are subjected to condensation reaction to give diastereomers of the amide compound or the ester compound, respectively. The separated diastereomer is converted to an optical isomer of the original compound by acid hydrolysis or base hydrolysis reaction.

When compound (I) is obtained as a free compound, the compound can be converted to an objective salt according to a method known per se or a method analogous thereto. Conversely, when it is obtained as a salt, the salt can be converted to a free form or other objective salt by a method known per se or a method analogous thereto.

Compound (I) may be a prodrug, and the prodrug of compound (I) refers to a compound which is converted to compound (I) as a result of a reaction with an enzyme, gastric acid, etc. under physiological conditions in vivo, thus a compound that undergoes enzymatic oxidation, reduction, hydrolysis etc. to convert to compound (I) and a compound that undergoes hydrolysis and the like by gastric acid, etc. to convert to compound (I).

Examples of the prodrug for compound (I) include a compound obtained by subjecting an amino group in compound (I) to acylation, alkylation or phosphorylation (e.g., a compound obtained by subjecting an amino group in compound (I) to eicosanoylation, alanylation, pentylaminocarbonylation, (5-methyl-2-oxo-1,3-dioxolen-4-yl)methoxycarbonylation, tetrahydrofuranylation, pyrrolidylmethylation, pivaloyloxymethylation, t-butylation and the like);

a compound obtained by subjecting a hydroxy group in compound (I) to acylation, alkylation, phosphorylation or boration (e.g., a compound obtained by subjecting a hydroxy group in compound (I) to acetylation, palmitoylation, propanoylation, pivaloylation, succinylation, fumarylation, alanylation or dimethylaminomethylcarbonylation and the like); a compound obtained by subjecting a carboxyl group in compound (I) to esterification or amidation (e.g., a compound obtained by subjecting a carboxyl group in compound (I) to ethyl esterification, phenyl esterification, carboxymethyl esterification, dimethylaminomethyl esterification, pivaloyloxymethyl esterification, ethoxycarbonyloxyethyl esterification, phthalidyl esterification, (5-methyl-2-oxo-1,3-dioxolen-4-yl)methyl esterification, cyclohexyloxycarbonylethyl esterification or methylamidation and the like) and the like. Any of these compounds can be produced from compound (I) according to a method known per se.

A prodrug of compound (I) may also be one which is converted to compound (I) under physiological conditions as described in “IYAKUHIN no KAIHATSU (Development of Pharmaceuticals)”, Vol. 7, Design of Molecules, p. 163-198 (HIROKAWA SHOTEN).

Compound (I) may be a crystal, and a single crystal form and a mixture of crystal forms are both encompassed in compound (I) of the present invention. The crystal can be produced by crystallizing according to a crystallization method known per se.

Compound (I) is effective for mammals (e.g., mouse, rat, hamster, rabbit, cat, dog, bovine, sheep, monkey, human etc.) as an agent for the prophylaxis or treatment of diseases, for example,

(1) psychiatric diseases [e.g., depression, major depression, bipolar depression, dysthymic disorder, emotional disorder (seasonal affective disorder and the like), recurrent depression, postpartum depression, stress disorder, depression symptom, mania, anxiety, generalized anxiety disorder, anxiety syndrome, panic disorder, phobia, social phobia, social anxiety disorder, obsessive disorder, post-traumatic stress syndrome, post-traumatic stress disorder, Tourette syndrome, autism, autism spectrum syndrome, fragile X syndrome, Rett syndrome, adjustment disorder, bipolar disorder, neurosis, schizophrenia (e.g., positive symptom, negative symptom, cognitive impairment), cognitive dysfunction associated with schizophrenia, chronic fatigue syndrome, anxiety neurosis, compulsive neurosis, epilepsy, anxiety, anxious mental state, emotional abnormality, cyclothymia, nervous erethism, faint, addiction, low sex drive, attention deficit hyperactivity disorder (ADHD), psychotic major depression, refractory major depression, treatment-resistant depression], (2) neurodegenerative diseases [e.g., Alzheimer's disease, Alzheimer-type senile dementia, Parkinson's disease, Parkinson's disease dementia, Huntington's disease, multi-infarct dementia, frontotemporal dementia, frontotemporal dementia Parkinson's Type, progressive supranuclear palsy, Pick's syndrome, Niemann-Pick syndrome, corticobasal degeneration, Down's syndrome, vascular dementia, postencephalitic parkinsonism, dementia with Lewy bodies, HIV dementia, amyotrophic lateral sclerosis (ALS), motor neurogenesis disease (MND), Creutzfeldt-Jakob disease or prion disease, cerebral palsy, multiple sclerosis], (3) age-related cognition memory disorders [e.g., age-related memory disorders, senile dementia], (4) sleep disorders [e.g., intrinsic sleep disorders (e.g., psychophysiological insomnia and the like), extrinsic sleep disorder, circadian rhythm disorders (e.g., time zone change syndrome (jet lag), shift work sleep disorder, irregular sleep-wake pattern, delayed sleep phase syndrome, advanced sleep phase syndrome, non-24-hour sleep-wake and the like), parasomnia, sleep disorders associated with internal medical or psychiatric disorder (e.g., chronic obstructive pulmonary diseases, Alzheimer's disease, Parkinson's disease, cerebrovascular dementia, schizophrenia, depression, anxiety neurosis), stress insomnia, insomnia, insomniac neurosis, sleep apnea syndrome], (5) respiratory depression caused by anesthetics, traumatic disease, or neurodegenerative disease and the like, (6) traumatic brain injury, cerebral apoplexy, neurotic anorexia, eating disorder, anorexia nervosa, hyperorexia, other eating disorder, alcohol dependence, alcohol abuse, alcoholic amnesia, alcohol paranoia, alcohol preference, alcohol withdrawal, alcoholic insanity, alcohol poisoning, alcoholic jealousy, alcoholic mania, alcohol-dependent psychiatric disorder, alcoholic insanity, pharmacophilia, pharmacophobia, pharmacomania, drug withdrawal, migraine, stress headache, catatonic headache, diabetic neuropathy, obesity, diabetes, muscular spasm, Meniere's disease, autonomic ataxia, alopecia, glaucoma, hypertension, cardiac disease, tachycardia, congestive cardiac failure, hyperventilation, bronchial asthma, apnea, sudden infant death syndrome, inflammatory disease, allergic disease, impotence, climacteric disorder, infertility, cancer, immunodeficiency syndrome caused by HIV infection, immunodeficiency syndrome caused by stress, cerebrospinal meningitis, acromegaly, incontinence, metabolic syndrome, osteoporosis, peptic ulcer, irritable bowel syndrome, inflammatory bowel disease, ulcerative colitis, Crohn's disease, stress gastrointestinal disorder, nervous vomiting, peptic ulcer, diarrhea, constipation, postoperative ileus, (7) pain and the like. Compound (I) is particularly preferably effective as a cholinergic muscarinic M1 receptor positive allosteric modulator, a prophylactic or therapeutic drug for Alzheimer's disease, schizophrenia, pain, sleep disorder, Parkinson's disease dementia, dementia with Lewy bodies and the like.

Since compound (I) has an excellent cholinergic muscarinic M1 receptor positive allosteric modulator activity, it is expected to provide an excellent prophylactic or therapeutic effect for the above-mentioned diseases.

Since compound (I) is excellent in solubility in water, the Japanese Pharmacopoeia dissolution test 2nd fluid, or the Japanese Pharmacopoeia disintegration test 2nd fluid, excellent in in vivo kinetics (e.g., plasma drug half-life, intracerebral migration, metabolic stability, CYP inhibition), shows low toxicity (e.g., more excellent as a medicament in terms of acute toxicity, chronic toxicity, genetic toxicity, reproductive toxicity, cardiotoxicity, drug interaction, carcinogenicity, phototoxicity and the like), and also has excellent properties as a pharmaceutical product such as a few side effects and the like, it can be safely administered orally or parenterally to a mammal (e.g., mouse, rat, hamster, rabbit, cat, dog, bovine, sheep, monkey, human and the like). Examples of the “parenteral” include intravenous, intramuscular, subcutaneous, intra-organ, intranasal, intradermal, instillation, intracerebral, intrarectal, intravaginal, intraperitoneal and intratumor administrations, administration to the vicinity of tumor etc. and direct administration to the lesion.

A preparation containing compound (I) may be any of a solid preparation such as powder, granule, tablet, capsule, orally disintegrable film and the like, or a liquid agent such as syrup, emulsion, injection and the like.

The medicament of the present invention can be produced by a conventional method such as blending, kneading, granulation, tableting, coating, sterilization treatment, emulsification and the like according to the form of the preparation. As for the production of the preparation, for example, each item of the Japanese Pharmacopoeia Preparation General Rules and the like can be referred to. In addition, the medicament of the present invention may be formed into a sustained-release preparation containing an active ingredient and a biodegradable polymer compound. The sustained-release preparation can be produced according to the method described in JP-A-9-263545.

In the preparation of the present invention, the content of compound (I) varies depending on the form of the preparation, but is generally 0.01 to 100% by weight, preferably 0.1 to 50% by weight, more preferably 0.5 to 20% by weight, as the amount of compound (I) relative to the whole preparation.

When compound (I) is used as the above-mentioned pharmaceutical products, it may be used alone or in admixture with a suitable, pharmacologically acceptable carrier, for example, excipients (e.g., starch, lactose, white soft sugar, calcium carbonate, calcium phosphate, etc.), binders (e.g., starch, arabic gum, carboxymethyl cellulose, hydroxypropyl cellulose, crystalline cellulose, alginic acid, gelatin, polyvinylpyrrolidone, etc.), lubricants (e.g., stearic acid, magnesium stearate, calcium stearate, talc, etc.), disintegrants (e.g., calcium carboxymethylcellulose, talc, etc.), diluents (e.g., water for injection, physiological saline, etc.) and if desired, with the additives (e.g., a stabilizer, a preservative, a colorant, a fragrance, a solubilizing agent, an emulsifier, a buffer, an isotonic agent, etc.) and the like, by a conventional method, which is processed into a dosage form of a solid agent such as powder, fine granule, granule, tablet, capsule and the like or a liquid form such as injection and the like, and administered orally or parenterally. When compound (I) is formed as a preparation for topical administration, it can also be directly administered to the affected part of an articular disease. In this case, an injection is preferable. The compound can also be administered as a parenteral agent for topical administration (e.g., intramuscular injection, subcutaneous injection, organ injection, injection to the vicinity of a joint and the like, solid preparation such as implant, granule, powder and the like, liquid such as suspension and the like, ointment etc.) and the like.

For formulation into an injection, for example, compound (I) is formulated into an aqueous suspension with a dispersing agent (e.g., surfactant such as Tween 80, HCO-60 and the like, polysaccharides such as carboxymethylcellulose, sodium alginate, hyaluronic acid and the like, polysorbate etc.), preservative (e.g., methylparaben, propylparaben etc.), isotonic agent (e.g., sodium chloride, mannitol, sorbitol, glucose etc.), buffer (e.g., calcium carbonate etc.), pH adjuster (e.g., sodium phosphate, potassium phosphate etc.) and the like to give a practical preparation for injection. In addition, an oily suspension can be obtained by dispersing the compound together with vegetable oil such as sesame oil, corn oil and the like or a mixture thereof with a phospholipid such as lecithin and the like, or medium-chain fatty acid triglyceride (e.g., miglyol 812 etc.) to give an injection to be actually used.

The dose of compound (I) varies depending on the subject of administration, administration route and symptoms and is not particularly limited. For example, for oral administration to adult patients (body weight adult 40 to 80 kg, for example, 60 kg) with Alzheimer's disease, the dose is, for example, 0.001 to 1000 mg/kg body weight/day, preferably 0.01 to 100 mg/kg body weight/day, more preferably 0.1 to 10 mg/kg body weight/day, as compound (I). This amount can be administered in one to three portions per day.

A medicament containing the compound of the present invention may be able to use the compound of the present invention solely or as a pharmaceutical composition of the compound of the present invention mixed with a pharmaceutically acceptable carrier according to a method known per se (e.g., the method described in the Japanese Pharmacopoeia etc.) as the production method of a pharmaceutical preparation. The medicament containing the compound of the present invention may be able to be administered safely in the form of, for example, tablet (including sugar-coated tablet, film-coated tablet, sublingual tablet, orally disintegrating tablet, buccal and the like), pill, powder, granule, capsule (including soft capsule, microcapsule), troche, syrup, liquid, emulsion, suspension, release control preparation (e.g., immediate-release preparation, sustained-release preparation, sustained-release microcapsule), aerosol, film (e.g., orally disintegrating film, oral mucosa-adhesive film), injection (e.g., subcutaneous injection, intravenous injection, intramuscular injection, intraperitoneal injection), drip infusion, transdermal absorption type preparation, ointment, lotion, adhesive preparation, suppository (e.g., rectal suppository, vaginal suppository), pellet, nasal preparation, pulmonary preparation (inhalant), eye drop and the like, orally or parenterally (e.g., intravenous, intramuscular, subcutaneous, intraorgan, intranasal, intradermal, instillation, intracerebral, intrarectal, intravaginal, intraperitoneal, lesion and the like).

As the aforementioned “pharmaceutically acceptable carrier”, various organic or inorganic carriers conventionally used as preparation materials (starting materials) can be used. For example, excipient, lubricant, binder, disintegrant and the like are used for solid preparations, and solvent, solubilizing agent, suspending agent, isotonic agent, buffer, soothing agent and the like are used for liquid preparations. Where necessary, preparation additives such as preservative, antioxidant, colorant, sweetening agent and the like can also be used.

Examples of the excipient include lactose, white soft sugar, D-mannitol, starch, corn starch, crystalline cellulose, light anhydrous silicic acid and the like.

Examples of the lubricant include magnesium stearate, calcium stearate, talc, colloidal silica and the like.

Examples of the binder include crystalline cellulose, white soft sugar, D-mannitol, dextrin, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinylpyrrolidone, starch, sucrose, gelatin, methylcellulose, carboxymethylcellulose sodium and the like.

Examples of the disintegrant include starch, carboxymethylcellulose, carboxymethylcellulose calcium, sodium carboxymethyl starch, L-hydroxypropylcellulose and the like.

Examples of the solvent include water for injection, alcohol, propylene glycol, macrogol, sesame oil, corn oil, olive oil and the like.

Examples of the solubilizing agent include polyethylene glycol, propylene glycol, D-mannitol, benzyl benzoate, ethanol, trisaminomethane, cholesterol, triethanolamine, sodium carbonate, sodium citrate and the like.

Examples of the suspending agent include surfactants such as stearyl triethanolamine, sodium lauryl sulfate, laurylaminopropionic acid, lecithin, benzalkonium chloride, benzetonium chloride, glycerin monostearate and the like; hydrophilic polymers such as polyvinyl alcohol, polyvinylpyrrolidone, carboxymethylcellulose sodium, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose and the like; and the like.

Examples of the isotonic agent include glucose, D-sorbitol, sodium chloride, glycerin, D-mannitol and the like.

Examples of the buffer include buffer solutions such as phosphate salts, acetate salts, carbonate salts, citrate salts and the like.

Examples of the soothing agent include benzyl alcohol and the like.

Examples of the preservative include p-oxybenzoate esters, chlorobutanol, benzyl alcohol, phenylethyl alcohol, dehydroacetic acid, sorbic acid and the like.

Examples of the antioxidant include sulfite salts, ascorbic acid, α-tocopherol and the like.

While the pharmaceutical composition varies according to the dosage form, administration method, carrier and the like, it can be produced according to a conventional method by adding the compound of the present invention in a proportion of generally 0.01-100% (w/w), preferably 0.1-95% (w/w), of the total amount of the preparation.

The compound of the present invention can be used in combination with other active ingredients (hereinafter to be abbreviated as concomitant drug).

Examples of the concomitant drug include the following. benzodiazepine (chlordiazepoxide, diazepam, potassium clorazepate, lorazepam, clonazepam, alprazolam etc.), L-type calcium channel inhibitor (pregabalin etc.), tricyclic or tetracyclic antidepressant (imipramine hydrochloride, amitriptyline hydrochloride, desipramine hydrochloride, clomipramine hydrochloride etc.), selective serotonin reuptake inhibitor (fluvoxamine maleate, fluoxetine hydrochloride, citalopram hydrobromide, sertraline hydrochloride, paroxetine hydrochloride, escitalopram oxalate etc.), serotonin-noradrenaline reuptake inhibitor (venlafaxine hydrochloride, duloxetine hydrochloride, desvenlafaxine hydrochloride etc.), noradrenaline reuptake inhibitor (reboxetine mesylate etc.), noradrenaline-dopamine reuptake inhibitor (bupropion hydrochloride etc.), mirtazapine, trazodone hydrochloride, nefazodone hydrochloride, bupropion hydrochloride, setiptiline maleate, 5-HT_(1A) agonist (buspirone hydrochloride, tandospirone citrate, osemozotan hydrochloride etc.), 5-HT₃ antagonist (cyamemazine etc.), heart non-selective β inhibitor (propranolol hydrochloride, oxprenolol hydrochloride etc.), histamine H₁ antagonist (hydroxyzine hydrochloride etc.), therapeutic drug for schizophrenia (chlorpromazine, haloperidol, sulpiride, clozapine, trifluoperazine hydrochloride, fluphenazine hydrochloride, olanzapine, quetiapine fumarate, risperidone, aripiprazole etc.), CRF antagonist, other antianxiety drug (meprobamate etc.), tachykinin antagonist (MK-869, saredutant etc.), medicament that acts on metabotropic glutamate receptor, CCK antagonist, β3 adrenaline antagonist (amibegron hydrochloride etc.), GAT-1 inhibitor (tiagabine hydrochloride etc.), N-type calcium channel inhibitor, carbonic anhydrase II inhibitor, NMDA glycine moiety agonist, NMDA antagonist (memantine etc.), peripheral benzodiazepine receptor agonist, vasopressin antagonist, vasopressin V1b antagonist, vasopressin V1a antagonist, phosphodiesterase inhibitor, opioid antagonist, opioid agonist, uridine, nicotinic acid receptor agonist, thyroid hormone (T3, T4), TSH, TRH, MAO inhibitor (phenelzine sulfate, tranylcypromine sulfate, moclobemide etc.), 5-HT_(2A) antagonist, 5-HT_(2A) inverse agonist, COMT inhibitor (entacapone etc.), therapeutic drug for bipolar disorder (lithium carbonate, sodium valproate, lamotrigine, riluzole, felbamate etc.), cannabinoid CB1 antagonist (rimonabant etc.), FAAH inhibitor, sodium channel inhibitor, anti-ADHD drug (methylphenidate hydrochloride, methamphetamine hydrochloride etc.), therapeutic drug for alcoholism, therapeutic drug for autisma, therapeutic drug for chronic fatigue syndrome, therapeutic drug for spasm, therapeutic drug for fibromyalgia syndrome, therapeutic drug for headache, therapeutic drug for insomnia (etizolam, zopiclone, triazolam, zolpidem, ramelteon, indiplon etc.), therapeutic drug for quitting smoking, therapeutic drug for myasthenia gravis, therapeutic drug for cerebral infarction, therapeutic drug for mania, therapeutic drug for hypersomnia, therapeutic drug for pain, therapeutic drug for dysthymia, therapeutic drug for autonomic ataxia, therapeutic drug for male and female sexual dysfunction, therapeutic drug for migraine, therapeutic drug for pathological gambler, therapeutic drug for restless legs syndrome, therapeutic drug for substance addiction, therapeutic drug for alcohol-related syndrome, therapeutic drug for irritable bowel syndrome, therapeutic drug for Alzheimer's disease (donepezil, galanthamine, memantine, rivastigmine etc.), therapeutic drug for Parkinson's disease (levodopa, carbidopa, benserazide, selegiline, rasagiline, zonisamide, entacapone, amantadine, talipexole, pramipexole, ropinirole, rotigotine, apomorphine, cabergoline, pergolide, bromocriptine, istradefylline, trihexyphenidyl, biperiden, piroheptine, profenamine, promethazine, droxidopa, combination of those drugs etc.), therapeutic drug for Parkinson's disease dementia (rivastigmine), therapeutic drug for dementia with Lewy bodies (donepezil), therapeutic drug for ALS (riluzole, neurotrophic factor etc.), therapeutic drug for lipid abnormality such as cholesterol-lowering drug (statin series (pravastatin sodium, atorvastatin, simvastatin, rosuvastatin etc.), fibrate (clofibrate etc.), squalene synthetase inhibitor), therapeutic drug for abnormal behavior or suppressant of dromomania due to dementia (sedatives, antianxiety drug etc.), apoptosis inhibitor, antiobesity drug, therapeutic drug for diabetes, therapeutic drug for hypertension, therapeutic drug for hypotension, therapeutic drug for rheumatism (DMARD), anti-cancer agent, therapeutic drug for hypothyroidism (PTH), calcium receptor antagonist, sex hormone or a derivative thereof (progesterone, estradiol, estradiol benzoate etc.), neuronal differentiation promoter, nerve regeneration promoter, non-steroidal anti-inflammatory drug (meloxicam, tenoxicam, indomethacin, ibuprofen, celecoxib, rofecoxib, aspirin etc.), steroid (dexamethasone, cortisone acetate etc.), anti-cytokine drug (TNF inhibitor, MAP kinase inhibitor etc.), antibody medicament, nucleic acid or nucleic acid derivative, aptamer drug and the like.

By combining the compound of the present invention and a concomitant drug, a superior effect such as

(1) the dose can be reduced as compared to single administration of the compound of the present invention or a concomitant drug, (2) the drug to be combined with the compound of the present invention can be selected according to the condition of patients (mild case, severe case and the like), (3) the period of treatment can be set longer by selecting a concomitant drug having different action and mechanism from the compound of the present invention, (4) a sustained treatment effect can be designed by selecting a concomitant drug having different action and mechanism from the compound of the present invention, (5) a synergistic effect can be afforded by a combined use of the compound of the present invention and a concomitant drug, and the like, can be achieved.

Hereinafter the compound of the present invention and a concomitant drug used in combination are referred to as the “combination agent of the present invention”.

When using the combination agent of the present invention, the administration time of the compound of the present invention and the concomitant drug is not restricted, and the compound of the present invention or a pharmaceutical composition thereof or the concomitant drug or a pharmaceutical composition thereof can be administered to an administration subject simultaneously, or may be administered at different times. The dosage of the concomitant drug may be determined according to the dose clinically used, and can be appropriately selected depending on an administration subject, administration route, disease, combination and the like.

The administration mode of the combination agent of the present invention is not particularly restricted, and it is sufficient that the compound of the present invention and the concomitant drug are combined in administration. Examples of the administration mode include the following methods: (1) administration of a single preparation obtained by simultaneously processing the compound of the present invention and the concomitant drug, (2) simultaneous administration of two kinds of preparations of the compound of the present invention and the concomitant drug, which have been separately produced, by the same administration route, (3) administration of two kinds of preparations of the compound of the present invention and the concomitant drug, which have been separately produced, by the same administration route in a staggered manner, (4) simultaneous administration of two kinds of preparations of the compound of the present invention and the concomitant drug, which have been separately produced, by different administration routes, (5) administration of two kinds of preparations of the compound of the present invention and the concomitant drug, which have been separately produced, by different administration routes in a staggered manner (e.g., administration in the order of the compound of the present invention and the concomitant drug, or in the reverse order) and the like.

The combination agent of the present invention exhibits low toxicity. For example, the compound of the present invention or(and) the aforementioned concomitant drug can be combined with a pharmacologically acceptable carrier according to the known method to prepare a pharmaceutical composition such as tablets (including sugar-coated tablet and film-coated tablet), powders, granules, capsules (including soft capsule), liquids, injections, suppositories, sustained-release agents, etc. These compositions can be administered safely orally or non-orally (e.g., topical, rectal, intravenous administration etc.). Injection can be administered intravenously, intramuscularly, subcutaneously, or by intraorgan administration or directly to the lesion.

Examples of the pharmacologically acceptable carriers usable for the production of a combination agent in the present invention, various organic or inorganic carrier substances conventionally used as preparation materials can be mentioned. For solid preparations, for example, excipient, lubricant, binder and disintegrant can be used. For liquid preparations, for example, solvent, solubilizing agent, suspending agent, isotonic agent, buffering agent, soothing agent and the like can be used. Where necessary, a suitable amount of conventional preservative, antioxidant, colorant, sweetening agent, adsorbent, wetting agent and the like can be used as appropriate.

Examples of the excipient include lactose, white soft sugar, D-mannitol, starch, corn starch, crystalline cellulose, light anhydrous silicic acid and the like.

Examples of the lubricant include magnesium stearate, calcium stearate, talc, colloidal silica and the like.

Examples of the binder include crystalline cellulose, white soft sugar, D-mannitol, dextrin, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinylpyrrolidone, starch, sucrose, gelatin, methylcellulose, carboxymethylcellulose sodium and the like.

Examples of the disintegrant include starch, carboxymethylcellulose, carboxymethylcellulose calcium, sodium carboxymethyl starch, L-hydroxypropylcellulose and the like.

Examples of the solvent include water for injection, alcohol, propylene glycol, macrogol, sesame oil, corn oil, olive oil and the like.

Examples of the solubilizing agent include polyethylene glycol, propylene glycol, D-mannitol, benzyl benzoate, ethanol, trisaminomethane, cholesterol, triethanolamine, sodium carbonate, sodium citrate and the like.

Examples of the suspending agent include surfactants such as stearyl triethanolamine, sodium lauryl sulfate, laurylaminopropionic acid, lecithin, benzalkonium chloride, benzetonium chloride, glycerin monostearate and the like; hydrophilic polymers such as polyvinyl alcohol, polyvinylpyrrolidone, carboxymethylcellulose sodium, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose and the like; and the like.

Examples of the isotonic agent include glucose, D-sorbitol, sodium chloride, glycerin, D-mannitol and the like.

Examples of the buffer include buffer solutions such as phosphate salts, acetate salts, carbonate salts, citrate salts and the like.

Examples of the soothing agent include benzyl alcohol and the like.

Examples of the preservative include p-oxybenzoate esters, chlorobutanol, benzyl alcohol, phenylethyl alcohol, dehydroacetic acid, sorbic acid and the like.

Examples of the antioxidant include sulfite salts, ascorbic acid, α-tocopherol and the like.

The mixing ratio of the compound of the present invention to the concomitant drug in the combination agent of the present invention can be appropriately selected depending on an administration subject, administration route, diseases and the like.

For example, the content of the compound of the present invention in the combination agent of the present invention differs depending on the form of a preparation, and usually from about 0.01 to 100 wt %, preferably from about 0.1 to 50 wt %, further preferably from about 0.5 to 20 wt %, based on the whole preparation.

The content of the concomitant drug in the combination agent of the present invention differs depending on the form of a preparation, and usually from about 0.01 to 100 wt %, preferably from about 0.1 to 50 wt %, further preferably from about 0.5 to 20 wt %, based on the whole preparation.

The content of additives such as a carrier and the like in the combination agent of the present invention differs depending on the form of a preparation, and usually from about 1 to 99.99 wt %, preferably from about 10 to 90 wt %, based on the whole preparation.

When the compound of the present invention and a concomitant drug are separately formulated into preparations, the contents thereof are similar to the above.

EXAMPLES

The present invention is explained in detail in the following by referring to Examples, Experimental Examples and Formulation Examples, which are not to be construed as limitative, and the invention may be changed within the scope of the present invention.

In the following Examples, the “room temperature” generally means about 10° C. to about 35° C. The ratios indicated for mixed solvents are volume mixing ratios, unless otherwise specified. % means wt %, unless otherwise specified.

In silica gel column chromatography, the indication of NH means use of aminopropylsilane-bonded silica gel. In HPLC (high performance liquid chromatography), the indication of C18 means use of octadecyl-bonded silica gel. The ratio of elution solvents is, unless otherwise specified, a volume mixing ratio.

In the Examples, unless particularly indicated, “osmium oxide (immobilized catalyst I)” refers to osmium(VIII) oxide (about 7% content) immobilized on a polymer with high solvent resistance, which is commercially available from Wako Pure Chemical Industries, Ltd. In addition, “sodium hydride” means a 60% oil dispersion (mineral mixture).

In Examples, the following abbreviations are used.

MS: mass spectrum M: molar concentration CDCl₃: deuterated chloroform DMSO: dimethyl sulfoxide DMSO-d₆: deuterated dimethyl sulfoxide ¹H NMR: proton nuclear magnetic resonance LC/MS: liquid chromatography mass spectrometer ESI: electrospray ionization APCI: atmospheric chemical ionization DME: 1,2-dimethoxyethane

DMF: N,N-dimethylformamide

HATU: 2-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexa fluorophosphate THF: tetrahydrofuran

¹H NMR (proton nuclear magnetic resonance spectrum) was measured by Fourier-transform NMR. For the analysis, ACD/SpecManager (trade name) and the like were used. Very mild peaks for protons of a hydroxy group, an amino group and the like are not sometimes described.

MS (mass spectrum) was measured by LC/MS (liquid chromatography mass spectrometer). As ionization, ESI (Electro Spray Ionization) method, or APCI (Atmospheric Pressure Chemical Ionization) method was used. The data indicates those found. Generally, molecular ion peaks are observed. When a compound having a tert-butoxycarbonyl group (-Boc) is used, a peak free of a tert-butoxycarbonyl group or a tert-butyl group may be observed as a fragment ion. In addition, when a compound having a hydroxyl group (—OH) is used, a peak free of H₂O may be observed as a fragment ion. In the case of a salt, generally, a molecular ion peak or a fragment ion peak of a free form is observed.

Example 1 4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) methyl 4-chloro-6-(2,2-difluoropropoxy)pyrimidine-5-carboxylate

To a solution of 2,2-difluoropropan-1-ol (1.30 g) in THF (25 mL) was added 60% sodium hydride (0.64 g) at 0° C., and the mixture was stirred at the same temperature for 20 min. To the reaction mixture was added methyl 4,6-dichloropyrimidine-5-carboxylate (2.55 g), and the mixture was stirred under an argon atmosphere at 0° C. for 1 hr. The reaction mixture was diluted with ethyl acetate, and the organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (2.81 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.70 (3H, t, J=19.2 Hz), 3.92 (3H, s), 4.77 (2H, t, J=12.8 Hz), 8.84 (1H, s).

B) methyl 4-(2,2-difluoropropoxy)-6-vinylpyrimidine-5-carboxylate

A mixture of methyl 4-chloro-6-(2,2-difluoropropoxy)pyrimidine-5-carboxylate (2.81 g), 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (2.44 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.43 g), 2 M aqueous sodium carbonate solution (10.54 mL) and DME (30 mL) was stirred under an argon atmosphere at 90° C. for 2 hr. The reaction mixture was diluted with ethyl acetate, and the organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (1.66 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.70 (3H, t, J=19.3 Hz), 3.90 (3H, s), 4.72 (2H, t, J=12.7 Hz), 5.68-5.91 (1H, m), 6.53-6.90 (2H, m), 8.86 (1H, s).

C) 4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a mixture of methyl 4-(2,2-difluoropropoxy)-6-vinylpyrimidine-5-carboxylate (2.0 g), osmium oxide (immobilized catalyst I) (0.42 g) and acetonitrile (15 mL)-acetone (15 mL)-water (15 mL) was added sodium periodate (6.63 g) at 0° C., and the mixture was stirred at room temperature overnight. The reaction mixture was filtered through celite, and the filtrate was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. A solution of the obtained oil and (4-(1-ethyl-1H-pyrazol-4-yl)phenyl)methanamine (0.66 g) in THF (9 mL) was stirred at room temperature for 1 hr. Methanol (0.5 mL) and sodium triacetoxyhydroborate (3.47 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane), and crystallized from ethyl acetate to give the title compound (0.51 g).

¹H NMR (300 MHz, CDCl₃) δ 1.45-1.54 (3H, m), 1.85 (3H, t, J=18.8 Hz), 4.12-4.27 (2H, m), 4.29 (2H, s), 4.69-4.85 (4H, m), 7.28-7.37 (2H, m), 7.40-7.49 (2H, m), 7.63 (1H, s), 7.75 (1H, s), 8.83 (1H, s).

Example 2 4-(2,2-difluoroethoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) methyl 4-(2,2-difluoroethoxy)-6-vinylpyrimidine-5-carboxylate

To a solution of methyl 4,6-dichloropyrimidine-5-carboxylate (3.0 g) and 2,2-difluoroethanol (1.31 g) in THF (20 mL) was added a mixture of 60% sodium hydride (0.64 g) and THF (5 mL) at 0° C., and the mixture was stirred at room temperature for 1 hr. To the reaction mixture were added water and ethyl acetate at 0° C. The organic layer was separated, washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. A mixture of the obtained oil, 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (3.12 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.36 g), 2 M aqueous sodium carbonate solution (14.5 mL) and DME (30 mL)-water (3 mL) was stirred under an argon atmosphere at 90° C. overnight. Water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (2.31 g).

MS: [M+H]+245.1

B) methyl 4-(2,2-difluoroethoxy)-6-formylpyrimidine-5-carboxylate

To a mixture of methyl 4-(2,2-difluoroethoxy)-6-vinylpyrimidine-5-carboxylate (2.31 g) and osmium oxide (immobilized catalyst I) (0.52 g) in acetonitrile (10 mL)-acetone (10 mL)-water (10 mL) was added sodium periodate (8.09 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, water was added to the filtrate, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (2.07 g).

MS: [M+H]+247.1

C) 4-(2,2-difluoroethoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

A mixture of methyl 4-(2,2-difluoroethoxy)-6-formylpyrimidine-5-carboxylate (0.20 g), anhydrous magnesium sulfate (0.20 g), (4-(1-ethyl-1H-pyrazol-4-yl)phenyl)methanamine (0.17 g) and THF (3 mL) was stirred at room temperature for 1 hr. Methanol (0.5 mL) and sodium triacetoxyhydroborate (0.86 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 3 hr. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate to give the title compound (0.086 g).

¹H NMR (300 MHz, CDCl₃) δ 1.53 (3H, t, J=7.2 Hz), 4.20 (2H, q, J=7.2 Hz), 4.30 (2H, s), 4.72-4.89 (4H, m), 6.00-6.47 (1H, m), 7.28-7.33 (2H, m), 7.42-7.47 (2H, m), 7.63 (1H, s), 7.75 (1H, s), 8.84 (1H, s).

Example 3 4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) 4-(2,2-difluoropropoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a mixture of methyl 4-(2,2-difluoropropoxy)-6-vinylpyrimidine-5-carboxylate (1.66 g), osmium oxide (immobilized catalyst I) (0.33 g) and acetonitrile (9 mL)-acetone (9 mL)-water (9 mL) was added sodium periodate (5.50 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. A solution of a part (0.15 g) of the obtained residue and (4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorophenyl)methanamine (0.15 g) in THF (3 mL) was stirred under an argon atmosphere at room temperature for 20 min. Methanol (1 mL) and sodium triacetoxyhydroborate (0.61 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. Sodium triacetoxyhydroborate (0.37 g) was added, and the mixture was further stirred at room temperature for 20 min. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane), and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.066 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.39 (3H, t, J=7.3 Hz), 1.77 (3H, t, J=19.3 Hz), 4.13 (2H, q, J=7.4 Hz), 4.49 (2H, s), 4.68-4.90 (4H, m), 7.26-7.55 (3H, m), 7.91 (1H, s), 8.25 (1H, s), 8.95 (1H, s).

Example 4 4-(2,2-difluoroethoxy)-6-(4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

A mixture of methyl 4-(2,2-difluoroethoxy)-6-formylpyrimidine-5-carboxylate (0.20 g), anhydrous magnesium sulfate (0.20 g), (4-(1-ethyl-1H-pyrazol-4-yl)-2-fluorophenyl)methanamine (0.19 g) and THF (3 mL) was stirred at room temperature for 1 hr. Methanol (0.5 mL) and sodium triacetoxyhydroborate (0.86 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane), and crystallized from ethyl acetate/diethyl ether to give the title compound (0.11 g).

¹H NMR (300 MHz, CDCl₃) δ 1.53 (3H, t, J=7.3 Hz), 4.20 (2H, q, J=7.4 Hz), 4.39 (2H, s), 4.72-4.86 (4H, m), 6.00-6.46 (1H, m), 7.14-7.25 (2H, m), 7.32-7.42 (1H, m), 7.63 (1H, s), 7.74 (1H, s), 8.84 (1H, s).

Example 5 6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-4-(2-fluoro-2-methylpropoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) (4-(1,3-dimethyl-1H-pyrazol-4-yl)phenyl)methanamine

A mixture of 1,3-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (2.0 g), (4-bromophenyl)methanamine (1.52 g), tetrakis(triphenylphosphine)palladium(0) (0.28 g), 2 M aqueous sodium carbonate solution (8.19 mL) and DME (30 mL)-water (3 mL) was stirred under an argon atmosphere at 90° C. overnight. The reaction mixture was concentrated, and THF was added to the residue. The insoluble material was filtered off. The filtrate was concentrated, and the residue was purified by silica gel column chromatography (ethyl acetate/methanol) to give the title compound (0.69 g).

¹H NMR (300 MHz, CDCl₃) δ 1.73 (2H, s), 2.39 (3H, s), 3.88 (5H, d, J=4.7 Hz), 7.29-7.43 (5H, m).

B) methyl 4-chloro-6-(2-fluoro-2-methylpropoxy)pyrimidine-5-carboxylate

To a solution of methyl 4,6-dichloropyrimidine-5-carboxylate (3.0 g) and 2-fluoro-2-methylpropan-1-ol (1.47 g) in THF (20 mL) was added 60% sodium hydride (0.64 g) at 0° C., and the mixture was stirred at the same temperature for 1 hr. The reaction solution was neutralized with 1N hydrochloric acid at 0° C., and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (2.93 g).

MS: [M+H]+ 263.1

C) methyl 4-(2-fluoro-2-methylpropoxy)-6-vinylpyrimidine-5-carboxylate

A mixture of methyl 4-chloro-6-(2-fluoro-2-methylpropoxy)pyrimidine-5-carboxylate (2.93 g), 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (2.58 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.46 g), 2 M aqueous sodium carbonate solution (11.15 mL) and DME (30 mL) was stirred under an argon atmosphere at 90° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (1.47 g).

MS: [M+H]+ 255.0

D) 6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-4-(2-fluoro-2-methylpropoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a mixture of methyl 4-(2-fluoro-2-methylpropoxy)-6-vinylpyrimidine-5-carboxylate (1.47 g), osmium oxide (immobilized catalyst I) (0.32 g) and acetonitrile (20 mL)-acetone (20 mL)-water (20 mL) was added sodium periodate (4.95 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. A mixture of the obtained oil (1.24 g), anhydrous magnesium sulfate (1.17 g), (4-(1,3-dimethyl-1H-pyrazol-4-yl)phenyl)methanamine (0.97 g) and THF (20 mL) was stirred under an argon atmosphere at room temperature for 20 min. Methanol (5 mL) and sodium triacetoxyhydroborate (5.13 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. Sodium triacetoxyhydroborate (3.08 g) was added, and the mixture was further stirred at room temperature for 20 min. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (1.06 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.43 (3H, s), 1.50 (3H, s), 2.27 (3H, s), 3.77 (3H, s), 4.45 (2H, s), 4.50-4.63 (2H, m), 4.69 (2H, s), 7.22-7.34 (2H, m), 7.35-7.46 (2H, m), 7.85 (1H, s), 8.91 (1H, s).

Example 6 4-(2,2-difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one A) ethyl 2-(2,2-difluoroethoxy)-4-iodonicotinate

To a solution of ethyl 2-fluoro-4-iodonicotinate (0.70 g) and 2,2-difluoroethanol (0.39 g) in THF (7 mL) was added 60% sodium hydride (0.14 g) at 0° C., and the mixture was stirred at 0° C. for 2 hr. To the reaction mixture was added water at 0° C., and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.69 g).

¹H NMR (300 MHz, CDCl₃) δ 1.40 (3H, t, J=7.1 Hz), 4.31-4.68 (4H, m), 5.69-6.33 (1H, m), 7.41 (1H, d, J=5.5 Hz), 7.80 (1H, d, J=5.5 Hz).

MS: [M+H]⁺ 357.9.

B) ethyl 2-(2,2-difluoroethoxy)-4-vinylnicotinate

To a solution of ethyl 2-(2,2-difluoroethoxy)-4-iodonicotinate (0.69 g) in DMF (7 mL) were added tributyl(vinyl)tin (0.79 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.16 g) and lithium chloride (0.61 g), and the mixture was stirred under a nitrogen atmosphere at 90° C. for 4 hr. To the reaction mixture was added a saturated aqueous potassium fluoride solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.42 g).

¹H NMR (300 MHz, CDCl₃) δ 1.38 (3H, t, J=7.2 Hz), 4.41 (2H, q, J=7.2 Hz), 4.56 (2H, td, J=13.3, 4.3 Hz), 5.55 (1H, d, J=11.0 Hz), 5.84-6.35 (2H, m), 6.75 (1H, dd, J=17.6, 11.0 Hz), 7.12 (1H, d, J=5.5 Hz), 8.11 (1H, d, J=5.5 Hz).

MS: [M+H]⁺ 258.1.

C) ethyl 2-(2,2-difluoroethoxy)-4-formylnicotinate

A mixture of ethyl 2-(2,2-difluoroethoxy)-4-vinylnicotinate (0.41 g), sodium periodate (1.71 g), osmium oxide (immobilized catalyst I) (0.20 g) and acetonitrile (4 mL)-acetone (4 mL)-water (4 mL) was stirred at room temperature overnight. The insoluble material in the reaction mixture was filtered off, the filtrate was diluted with a saturated aqueous sodium thiosulfate solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (0.37 g).

¹H NMR (300 MHz, CDCl₃) δ 1.40 (3H, t, J=7.2 Hz), 4.48 (2H, q, J=7.2 Hz), 4.62 (2H, td, J=13.2, 4.2 Hz), 5.86-6.36 (1H, m), 7.39 (1H, d, J=5.1 Hz), 8.41 (1H, d, J=5.1 Hz), 10.12 (1H, s).

D) 4-(2,2-difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

To a solution of ethyl 2-(2,2-difluoroethoxy)-4-formylnicotinate (0.18 g), (4-(1,3-dimethyl-1H-pyrazol-4-yl)phenyl)methanamine (0.17 g) in methanol (4 mL)-THF (2 mL) was added titanium tetraisopropoxide (0.22 g), and the mixture was stirred under a nitrogen atmosphere at room temperature for 1 hr. Sodium tetrahydroborate (0.053 g) was added to the reaction mixture at 0° C., and the mixture was stirred under a nitrogen atmosphere at room temperature overnight. To the reaction mixture was added water at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.12 g).

¹H NMR (300 MHz, CDCl₃) δ 2.37 (3H, s), 3.87 (3H, s), 4.28 (2H, s), 4.63-4.87 (4H, m), 6.00-6.57 (1H, m), 7.02 (1H, d, J=5.3 Hz), 7.29-7.37 (4H, m), 7.40 (1H, s), 8.24 (1H, d, J=5.3 Hz).

Example 7 4-(2,2-difluorobutoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one A) ethyl 2-fluoro-4-vinylnicotinate

To a solution of ethyl 2-fluoro-4-iodonicotinate (20 g) in DME (270 mL) were added 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (11.5 g), (1,1′-bis(diphenylphosphino)ferrocene)dichloropalladium(II) dichloromethane adduct (1.66 g) and 2 M aqueous sodium carbonate solution (68 mL), and the mixture was stirred under an argon atmosphere at 90° C. overnight. The reaction solution was diluted with water and ethyl acetate, and the organic layer was separated, washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated. The residue was purified by silica gel chromatography (ethyl acetate/hexane) to give the title compound (12.6 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.31 (3H, t, J=7.1 Hz), 4.39 (2H, q, J=7.1 Hz), 5.74 (1H, d, J=11.0 Hz), 6.23 (1H, d, J=17.4 Hz), 6.85 (1H, dd, J=17.5, 11.0 Hz), 7.73 (1H, dd, J=5.5, 1.3 Hz), 8.33 (1H, d, J=5.3 Hz).

B) ethyl 2-(2,2-difluorobutoxy)-4-vinylnicotinate

To a mixture of 2,2-difluorobutan-1-ol (0.52 g), 60% sodium hydride (0.22 g) and THF (10 mL) was added ethyl 2-fluoro-4-vinylnicotinate (0.77 g) at 0° C., and the mixture was stirred at the same temperature for 1 hr. The reaction mixture was neutralized with 1N hydrochloric acid at 0° C., and diluted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.64 g).

MS: [M+H]+ 286.1

C) ethyl 2-(2,2-difluorobutoxy)-4-formylnicotinate

To a mixture of ethyl 2-(2,2-difluorobutoxy)-4-vinylnicotinate (0.64 g), osmium oxide (immobilized catalyst I) (0.057 g) and acetonitrile (7 mL)-acetone (7 mL)-water (7 mL) was added sodium periodate (1.93 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (0.62 g).

¹H NMR (300 MHz, CDCl₃) δ 1.07 (3H, t, J=7.6 Hz), 1.41 (3H, t, J=7.2 Hz), 1.91-2.04 (2H, m), 4.47 (2H, q, J=7.2 Hz), 4.60 (2H, t, J=11.9 Hz), 7.37 (1H, d, J=5.1 Hz), 8.41 (1H, d, J=5.3 Hz), 10.12 (1H, s).

D) 2-(4-bromo-2-fluorobenzyl)-4-(2,2-difluorobutoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one

A mixture of ethyl 2-(2,2-difluorobutoxy)-4-formylnicotinate (0.31 g), anhydrous magnesium sulfate (0.26 g), 2-fluoro-4-bromobenzylamine (0.23 g) and THF (5 mL) was stirred at room temperature for 1 hr. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. To the residue were added acetic acid (5 mL) and sodium triacetoxyhydroborate (0.34 g), and the mixture was stirred at room temperature for 5 hr. The reaction mixture was concentrated, saturated aqueous sodium hydrogen carbonate solution was added at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) to give the title compound (0.34 g).

MS: [M+H]+ 429.0, 431.0

E) 4-(2,2-difluorobutoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

A mixture of 2-(4-bromo-2-fluorobenzyl)-4-(2,2-difluorobutoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.10 g), 1,3-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.067 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.0095 g), 2 M aqueous sodium carbonate solution (0.23 mL) and DME (3 mL)-water (0.3 mL) was stirred under an argon atmosphere at 90° C. overnight. The reaction mixture was diluted with water and ethyl acetate, and the organic layer was separated, washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.043 g).

¹H NMR (300 MHz, CDCl₃) δ 1.11 (3H, t, J=7.6 Hz), 2.06-2.29 (2H, m), 2.38 (3H, s), 3.87 (3H, s), 4.35 (2H, s), 4.69 (2H, t, J=11.8 Hz), 4.80 (2H, s), 7.01 (1H, d, J=5.3 Hz), 7.05-7.15 (2H, m), 7.34-7.43 (2H, m), 8.24 (1H, d, J=5.1 Hz).

Example 8 4-(2,2-difluorobutoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) methyl 4-chloro-6-(2,2-difluorobutoxy)pyrimidine-5-carboxylate

To a solution of 2,2-difluorobutan-1-ol (7.27 g) in THF (100 mL) was added 60% sodium hydride (2.16 g) at 0° C., and the mixture was stirred at the same temperature for 20 min. Methyl 4,6-dichloropyrimidine-5-carboxylate (8.0 g) was added, and the mixture was stirred under an argon atmosphere at 0° C. for 1 hr. To the reaction mixture was added ethyl acetate, and the organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (7.47 g).

¹H NMR (300 MHz, DMSO-d₆) δ 0.98 (3H, t, J=7.5 Hz), 1.86-2.11 (2H, m), 3.91 (3H, s), 4.79 (2H, t, J=13.0 Hz), 8.84 (1H, s).

B) methyl 4-(2,2-difluorobutoxy)-6-vinylpyrimidine-5-carboxylate

A mixture of methyl 4-chloro-6-(2,2-difluorobutoxy)pyrimidine-5-carboxylate (7.47 g), 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (6.15 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (1.09 g), 2 M aqueous sodium carbonate solution (26.6 mL) and DME (70 mL) was stirred under an argon atmosphere at 90° C. for 2 hr. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (4.42 g).

MS: [M+H]+ 273.0

C) methyl 4-(2,2-difluorobutoxy)-6-formylpyrimidine-5-carboxylate

To a mixture of methyl 4-(2,2-difluorobutoxy)-6-vinylpyrimidine-5-carboxylate (4.42 g), osmium oxide (immobilized catalyst I) (0.83 g) and acetonitrile (50 mL)-acetone (50 mL)-water (50 mL) was added sodium periodate (13.89 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (3.52 g).

MS: [M+H]+ 275.1

D) 4-(2,2-difluorobutoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

A mixture of methyl 4-(2,2-difluorobutoxy)-6-formylpyrimidine-5-carboxylate (2.7 g), anhydrous magnesium sulfate (2.37 g), (4-(1,3-dimethyl-1H-pyrazol-4-yl)phenyl)methanamine (1.98 g) and THF (80 mL) was stirred under an argon atmosphere at room temperature for 20 min. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was dissolved in THF (80 mL), methanol (12 mL) and sodium triacetoxyhydroborate (10.43 g) were added to the mixture, and the mixture was stirred at room temperature for 1 hr. Sodium triacetoxyhydroborate (1.04 g) was added, and the mixture was further stirred at room temperature for 20 min. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (1.45 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.03 (3H, t, J=7.5 Hz), 1.97-2.18 (2H, m), 2.27 (3H, s), 3.77 (3H, s), 4.48 (2H, s), 4.69 (2H, s), 4.84 (2H, t, J=13.1 Hz), 7.27-7.35 (2H, m), 7.36-7.44 (2H, m), 7.86 (1H, s), 8.95 (1H, s).

Example 9 6-(2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)benzyl)-4-(2,2,2-trifluoroethoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) tert-butyl 2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)benzylcarbamate

A mixture of tert-butyl 4-bromo-2-fluorobenzylcarbamate (1.46 g), 1-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.0 g), sodium carbonate (1.02 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) (0.35 g) and DME (13 mL)-water (4 mL) was stirred under an argon atmosphere at 90° C. overnight. The reaction mixture was diluted with water and ethyl acetate, and the organic layer was separated, washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated. The residue was purified by silica gel chromatography (ethyl acetate/hexane) to give the title compound (0.64 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.39 (9H, s), 3.88 (3H, s), 4.17 (2H, d, J=5.7 Hz), 6.72 (1H, d, J=2.3 Hz), 7.26-7.34 (1H, m), 7.38 (1H, brs), 7.51 (1H, dd, J=11.7, 1.5 Hz), 7.58 (1H, d, J=7.9 Hz), 7.73 (1H, d, J=2.1 Hz).

B) (2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)phenyl)methanamine

To tert-butyl 2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)benzylcarbamate (0.64 g) was added 2N hydrogen chloride (methanol solution) (7 mL), and the mixture was stirred under a nitrogen atmosphere at room temperature overnight. The reaction mixture was concentrated, and the residue was suspended in ethyl acetate. The precipitate was collected by filtration. The obtained white solid was dissolved in saturated aqueous sodium hydrogen carbonate solution, anhydrous sodium sulfate and THF were added and the insoluble material was filtered off. The filtrate was concentrated under reduced pressure to give the title compound (0.39 g).

¹H NMR (300 MHz, DMSO-d₆) δ 2.41 (2H, brs), 3.76 (2H, s), 3.87 (3H, s), 6.72 (1H, d, J=2.3 Hz), 7.43-7.53 (2H, m), 7.54-7.63 (1H, m), 7.73 (1H, d, J=2.1 Hz).

C) methyl 4-chloro-6-(2,2,2-trifluoroethoxy)pyrimidine-5-carboxylate

To a solution of methyl 4,6-dichloropyrimidine-5-carboxylate (1.0 g) and 2,2,2-trifluoroethanol (0.58 g) in THF (20 mL) was added 60% sodium hydride (0.21 g) at 0° C., and the mixture was stirred at 0° C. for 1 hr. To the reaction mixture was added water at 0° C., and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) to give the title compound (1.20 g).

¹H NMR (300 MHz, CDCl₃) δ 3.98 (3H, s), 4.74-5.02 (2H, m), 8.64 (1H, s).

MS: [M+H]⁺271.0.

D) methyl 4-(2,2,2-trifluoroethoxy)-6-vinylpyrimidine-5-carboxylate

To a solution of methyl 4-chloro-6-(2,2,2-trifluoroethoxy)pyrimidine-5-carboxylate (1.2 g) in DME (7 mL)-water (7 mL) were added 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (1.03 g), sodium carbonate (1.41 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.36 g), and the mixture was stirred under a nitrogen atmosphere at 90° C. for 2 hr. The reaction mixture was diluted with water, and extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.74 g).

¹H NMR (300 MHz, CDCl₃) δ 3.96 (3H, s), 4.81-4.89 (2H, m), 5.76 (1H, dd, J=10.3, 2.0 Hz), 6.63-6.96 (2H, m), 8.74 (1H, s).

MS: [M+H]⁺ 263.0.

E) methyl 4-formyl-6-(2,2,2-trifluoroethoxy)pyrimidine-5-carboxylate

A mixture of methyl 4-(2,2,2-trifluoroethoxy)-6-vinylpyrimidine-5-carboxylate (0.74 g), sodium periodate (3.02 g), osmium oxide (immobilized catalyst I) (0.22 g) and acetonitrile (6 mL)-acetone (6 mL)-water (6 mL) was stirred at room temperature overnight. The insoluble material in the reaction mixture was filtered off, the filtrate was diluted with saturated aqueous sodium thiosulfate solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (0.52 g).

¹H NMR (300 MHz, CDCl₃) δ 4.00 (3H, s), 4.79-4.98 (2H, m), 9.01 (1H, s), 10.00 (1H, s).

F) 6-(2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)benzyl)-4-(2,2,2-trifluoroethoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a solution of methyl 4-formyl-6-(2,2,2-trifluoroethoxy)pyrimidine-5-carboxylate (0.20 g), (2-fluoro-4-(1-methyl-1H-pyrazol-3-yl)phenyl)methanamine (0.16 g) in methanol (1.5 mL)-THF (1.5 mL) was added anhydrous magnesium sulfate (0.18 g), and the mixture was stirred under a nitrogen atmosphere at room temperature for 1 hr. The insoluble material in the reaction mixture was filtered off, and the filtrate was concentrated under reduced pressure. To a solution of the residue in acetic acid (1.5 mL) was added sodium triacetoxyhydroborate (0.24 g) at room temperature, and the mixture was stirred under a nitrogen atmosphere at room temperature for 3 hr. To the reaction mixture was added water, and the solvent was evaporated under reduced pressure. To the residue was added saturated aqueous sodium hydrogen carbonate solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane), and crystallized from THF/diisopropyl ether to give the title compound (0.016 g).

¹H NMR (300 MHz, CDCl₃) δ 3.95 (3H, s), 4.40 (2H, s), 4.84 (2H, s), 5.03 (2H, q, J=8.3 Hz), 6.51 (1H, d, J=2.3 Hz), 7.35-7.45 (2H, m), 7.52 (1H, s), 7.55 (1H, dd, J=3.6, 1.3 Hz), 8.85 (1H, s).

Example 10 4-((4-(2,2-difluorobutoxy)-5-oxo-5,7-dihydro-6H-pyrrolo[3,4-d]pyrimidin-6-yl)methyl)-N-methylbenzamide

A solution of methyl 4-(2,2-difluorobutoxy)-6-formylpyrimidine-5-carboxylate (0.60 g) and 4-(aminomethyl)-N-methylbenzamide (0.18 g) in THF (3 mL) was stirred at room temperature for 1 hr. Methanol (0.5 mL) and sodium triacetoxyhydroborate (1.16 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane, then methanol/ethyl acetate) and crystallized from ethyl acetate to give the title compound (0.16 g).

¹H NMR (300 MHz, CDCl₃) δ 1.12 (3H, t, J=7.6 Hz), 2.12 (2H, s), 3.01 (3H, d, J=4.9 Hz), 4.28 (2H, s), 4.68-4.88 (4H, m), 5.97-6.25 (1H, m), 7.37 (2H, d, J=8.3 Hz), 7.74 (2H, d, J=8.3 Hz), 8.84 (1H, s).

Example 11 6-(4-(2-methylpyridin-4-yl)benzyl)-4-(2,2,2-trifluoroethoxy)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a solution of methyl 4-formyl-6-(2,2,2-trifluoroethoxy)pyrimidine-5-carboxylate (0.19 g), (4-(2-methylpyridin-4-yl)phenyl)methanamine (0.15 g) in methanol (3 mL) was added anhydrous magnesium sulfate (0.17 g), and the mixture was stirred under a nitrogen atmosphere at room temperature for 1 hr. The insoluble material in the reaction mixture was filtered off, acetic acid (0.3 mL) and sodium triacetoxyhydroborate (0.23 g) were added to the filtrate, and the mixture was stirred under a nitrogen atmosphere at room temperature for 5 hr. The reaction mixture was concentrated under reduced pressure, saturated aqueous sodium hydrogen carbonate solution was added to the residue, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.038 g).

¹H NMR (300 MHz, CDCl₃) δ 2.62 (3H, s), 4.35 (2H, s), 4.83 (2H, s), 5.06 (2H, q, J=8.2 Hz), 7.24-7.36 (2H, m), 7.43 (2H, d, J=8.3 Hz), 7.61 (2H, d, J=8.1 Hz), 8.54 (1H, d, J=5.3 Hz), 8.87 (1H, s).

Example 12 4-(2,2-difluoropropoxy)-2-(4-(1-(2,2,2-trifluoroethyl)-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one A) ethyl 2-(2,2-difluoropropoxy)-4-vinylnicotinate

To a mixture of 2,2-difluoro-1-propanol (0.89 g), 60% sodium hydride (0.43 g) and THF (15 mL) was added ethyl 2-fluoro-4-vinylnicotinate (1.5 g) at 0° C., and the mixture was stirred at the same temperature for 1 hr. The reaction mixture was neutralized with 1N hydrochloric acid at 0° C., and extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (1.81 g).

MS: [M+H]+ 272.1

B) ethyl 2-(2,2-difluoropropoxy)-4-formylnicotinate

To a mixture of ethyl 2-(2,2-difluoropropoxy)-4-vinylnicotinate (1.80 g), osmium oxide (immobilized catalyst I) (0.67 g) and acetonitrile (10 mL)-acetone (10 mL)-water (10 mL) was added sodium periodate (7.10 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (1.80 g).

¹H NMR (300 MHz, CDCl₃) δ 1.41 (3H, t, J=7.2 Hz), 1.73 (3H, t, J=18.7 Hz), 4.48 (2H, q, J=7.2 Hz), 4.58 (2H, t, J=11.6 Hz), 7.37 (1H, d, J=5.1 Hz), 8.41 (1H, d, J=5.1 Hz), 10.12 (1H, s).

C) 2-(4-bromobenzyl)-4-(2,2-difluoropropoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one

A mixture of ethyl 2-(2,2-difluoropropoxy)-4-formylnicotinate (0.80 g), anhydrous magnesium sulfate (0.71 g), 4-bromobenzylamine (0.57 g) and THF (5 mL) was stirred at room temperature for 1 hr. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was dissolved in acetic acid (5 mL), sodium triacetoxyhydroborate (0.93 g) was added, and the mixture was stirred at room temperature for 5 hr. The reaction mixture was concentrated, saturated aqueous sodium hydrogen carbonate solution was added at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) to give the title compound (0.46 g).

MS: [M+H]+ 397.0, 399.1

D) 2-(4-(1H-pyrazol-4-yl)benzyl)-4-(2,2-difluoropropoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one

A mixture of 2-(4-bromobenzyl)-4-(2,2-difluoropropoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.35 g), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate (0.34 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.036 g), 2 M aqueous sodium carbonate solution (0.88 mL) and DME (3 mL)-water (0.3 mL) was stirred under an argon atmosphere at 90° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.22 g).

MS: [M+H]+ 385.2

E) 4-(2,2-difluoropropoxy)-2-(4-(1-(2,2,2-trifluoroethyl)-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

To a mixture of 2-(4-(1H-pyrazol-4-yl)benzyl)-4-(2,2-difluoropropoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.080 g), potassium carbonate (0.057 g) and acetonitrile (4 mL) was added 2,2,2-trifluoroethyl trifluoromethanesulfonate (0.072 g) at room temperature, and the mixture was stirred under a nitrogen atmosphere at 60° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.008 g).

¹H NMR (300 MHz, CDCl₃) δ 1.88 (3H, t, J=19.0 Hz), 4.25 (2H, s), 4.64-4.80 (6H, m), 6.99 (1H, d, J=5.1 Hz), 7.32 (2H, d, J=8.3 Hz), 7.42-7.49 (2H, m), 7.73 (1H, s), 7.84 (1H, s), 8.24 (1H, d, J=5.1 Hz).

Example 13 2-(4-(1-(2,2-difluoroethyl)-1H-pyrazol-4-yl)benzyl)-4-(2,2-difluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

To a mixture of 2-(4-(1H-pyrazol-4-yl)benzyl)-4-(2,2-difluoropropoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.070 g), potassium carbonate (0.050 g) and acetonitrile (4 mL) was added 2,2-difluoroethyl trifluoromethanesulfonate (0.058 g) at room temperature, and the mixture was stirred under a nitrogen atmosphere at 60° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.031 g).

¹H NMR (300 MHz, CDCl₃) δ 1.88 (3H, t, J=18.9 Hz), 4.25 (2H, s), 4.49 (2H, d, J=4.2 Hz), 4.63-4.87 (4H, m), 5.86-6.35 (1H, m), 6.99 (1H, d, J=5.3 Hz), 7.28-7.35 (2H, m), 7.41-7.49 (2H, m), 7.69 (1H, s), 7.81 (1H, s), 8.24 (1H, d, J=5.1 Hz).

Example 14 4-(2,2-difluoropropoxy)-2-(4-(2-methyl-2H-indazol-5-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one A) 4-(2,2-difluoropropoxy)-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one

A mixture of 2-(4-bromobenzyl)-4-(2,2-difluoropropoxy)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.31 g), palladium(II) acetate (0.009 g), potassium acetate (0.15 g), bis(pinacolato)diboron (0.28 g) and DMF (2 mL) was stirred under an argon atmosphere at 90° C. for 4 hr. To the reaction mixture was added saturated aqueous sodium hydrogen carbonate solution at 0° C., and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (0.30 g).

MS: [M+H]+ 445.2

B) 4-(2,2-difluoropropoxy)-2-(4-(2-methyl-2H-indazol-5-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

A mixture of 4-(2,2-difluoropropoxy)-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.10 g), 5-bromo-2-methyl-2H-indazole (0.063 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.009 g), 2 M aqueous sodium carbonate solution (0.23 mL) and DME (3 mL)-water (0.3 mL) was stirred under an argon atmosphere at 90° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane and silica gel, ethyl acetate/hexane), and crystallized from ethyl acetate to give the title compound (0.022 g).

¹H NMR (300 MHz, CDCl₃) δ 1.88 (3H, t, J=18.9 Hz), 4.24 (3H, s), 4.29 (2H, s), 4.71 (2H, t, J=11.6 Hz), 4.79 (2H, s), 7.00 (1H, d, J=5.3 Hz), 7.38 (2H, d, J=8.1 Hz), 7.49-7.55 (1H, m), 7.60 (2H, d, J=8.1 Hz), 7.70-7.83 (2H, m), 7.93 (1H, s), 8.24 (1H, d, J=5.1 Hz).

Example 15 4-(2,2-difluoroethoxy)-6-((5-(1,3-dimethyl-1H-pyrazol-4-yl)-3-fluoro-2-thienyl)methyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one A) 2-(azidomethyl)-3-fluorothiophene

To a solution of (3-fluorothiophen-2-yl)methanol (0.83 g) and 1,8-diazabicyclo[5.4.0]undec-7-ene (1.13 mL) in THF (8 mL) was added diphenylphosphoryl azide (1.61 mL), and the mixture was stirred at 70° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.54 g).

¹H NMR (300 MHz, CDCl₃) δ 4.44 (2H, s), 6.82 (1H, d, J=5.7 Hz), 7.20 (1H, dd, J=5.5, 4.0 Hz).

B) 2-(azidomethyl)-5-bromo-3-fluorothiophene

To a solution of 2-(azidomethyl)-3-fluorothiophene (0.51 g) in DMF (4 mL) was added N-bromosuccinimide (0.60 g) at 0° C., and the mixture was stirred at room temperature for 1 hr. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (0.83 g).

¹H NMR (300 MHz, CDCl₃) δ 4.38 (2H, s), 6.84 (1H, d, J=0.8 Hz).

C) 4-(5-(azidomethyl)-4-fluorothiophen-2-yl)-1,3-dimethyl-1H-pyrazole

A mixture of 2-(azidomethyl)-5-bromo-3-fluorothiophene (0.76 g), 1,3-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.93 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.079 g), 2 M aqueous sodium carbonate solution (3.23 mL) and DME (3 mL)-water (0.3 mL) was stirred under an argon atmosphere at 90° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.20 g).

MS: [M+H]+ 252.1

D) (5-(1,3-dimethyl-1H-pyrazol-4-yl)-3-fluorothiophen-2-yl)methanamine

A mixture of 4-(5-(azidomethyl)-4-fluorothiophen-2-yl)-1,3-dimethyl-1H-pyrazole (0.20 g), 10% palladium carbon (0.030 g) and methanol (3 mL) was stirred under a hydrogen atmosphere at room temperature for 1 hr, and at 50° C. for 2 hr. The insoluble material was filtered off, and the obtained solution was concentrated under reduced pressure. A mixture of the residue, 10% palladium carbon (0.030 g) and methanol (3 mL) was stirred under a hydrogen atmosphere at 50° C. for 1 hr. The insoluble material was filtered off, and the obtained solution was concentrated under reduced pressure to give the title compound (0.17 g).

MS: [M+H]+ 226.0

E) 4-(2,2-difluoroethoxy)-6-((5-(1,3-dimethyl-1H-pyrazol-4-yl)-3-fluoro-2-thienyl)methyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

A solution of methyl 4-(2,2-difluoroethoxy)-6-formylpyrimidine-5-carboxylate (0.18 g) and (5-(1,3-dimethyl-1H-pyrazol-4-yl)-3-fluorothiophen-2-yl)methanamine (0.17 g) in THF (3 mL) was stirred at room temperature for 1 hr. Methanol (0.5 mL) and sodium triacetoxyhydroborate (0.63 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane), and crystallized from diethyl ether to give the title compound (0.024 g).

¹H NMR (300 MHz, CDCl₃) δ 2.36 (3H, s), 3.83 (3H, s), 4.43 (2H, s), 4.79 (2H, td, J=12.8, 4.3 Hz), 4.85 (2H, s), 5.94-6.51 (1H, m), 6.68 (1H, s), 7.41 (1H, s), 8.85 (1H, s).

Example 16 2-(2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)benzyl)-4-(3,3,3-trifluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one A) tert-butyl 2-fluoro-4-((trimethylsilyl)ethynyl)benzylcarbamate

A mixture of tert-butyl 4-bromo-2-fluorobenzylcarbamate (10.0 g), ethynyltrimethylsilane (4.84 g), copper iodide (0.31 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (1.34 g) and acetonitrile (100 mL) was stirred under a nitrogen atmosphere at 70° C. for 3 hr. The reaction mixture was concentrated, water was added to the residue, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetate/hexane) to give the title compound (10.3 g).

¹H NMR (300 MHz, CDCl₃) δ 0.24 (9H, s), 1.44 (9H, s), 4.34 (2H, d, J=5.9 Hz), 4.87 (1H, brs), 7.13 (1H, d, J=10.8 Hz), 7.18-7.30 (2H, m).

B) tert-butyl 4-ethynyl-2-fluorobenzylcarbamate

A mixture of tert-butyl 2-fluoro-4-((trimethylsilyl)ethynyl)benzylcarbamate (10.3 g), potassium carbonate (4.87 g) and methanol (200 mL) was stirred at room temperature for 2 hr. The insoluble material was filtered off, and the filtrate was concentrated. Water was added to the residue, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (7.88 g).

¹H NMR (300 MHz, CDCl₃) δ 1.44 (9H, s), 3.09 (1H, s), 4.35 (2H, d, J=6.0 Hz), 4.89 (1H, brs), 7.12-7.19 (1H, m), 7.21-7.34 (2H, m).

C) tert-butyl 2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)benzylcarbamate

To a mixture of tert-butyl 4-ethynyl-2-fluorobenzylcarbamate (7.80 g), iodomethane (2.14 mL), tris(triphenylphosphine)copper bromide (2.91 g) and DMSO (80 mL) was added an aqueous solution (20 mL) of sodium azide (3.05 g) at room temperature, and the mixture was stirred under a nitrogen atmosphere at room temperature overnight. To the reaction mixture was added water, and the insoluble material was filtered off. The filtrate was extracted with ethyl acetate, and the extract was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated. Ethyl acetate was added to the residue, and the solid was collected by filtration to give the title compound (2.55 g).

¹H NMR (300 MHz, CDCl₃) δ 1.45 (9H, s), 4.15 (3H, s), 4.38 (2H, d, J=6.0 Hz), 4.92 (1H, brs), 7.33-7.44 (1H, m), 7.49-7.61 (2H, m), 7.74 (1H, s).

D) (2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)phenyl)methanamine

To a solution of tert-butyl 2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)benzylcarbamate (2.55 g) in ethanol (50 mL)-THF (25 mL) was added 4N hydrogen chloride (ethyl acetate solution, 10.4 mL) at room temperature, and the mixture was stirred at room temperature overnight. The reaction mixture was concentrated, and a solution of the residue in methanol was neutralized with triethylamine, and concentrated. The residue was purified by NH silica gel chromatography (ethyl acetate/hexane), and the obtained solid was washed with diisopropyl ether to give the title compound (1.70 g).

MS: [M+H]+ 207.1

E) ethyl 4-iodo-2-(3,3,3-trifluoropropoxy)nicotinate

To a solution of ethyl 2-fluoro-4-iodonicotinate (0.5 g) and 3,3,3-trifluoropropan-1-ol (0.77 g) in THF (20 mL) was added 60% sodium hydride (0.34 g) at 0° C., and the mixture was stirred at the same temperature for 1 hr. The reaction mixture was neutralized with 1N hydrochloric acid, and extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.53 g).

MS: [M+H]+ 390.0

F) 2-(2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)benzyl)-4-(3,3,3-trifluoropropoxy)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

A mixture of ethyl 4-iodo-2-(3,3,3-trifluoropropoxy)nicotinate (0.53 g), tributyl(vinyl)tin (0.64 g), trans-dichlorobis(triphenylphosphine)palladium(II) (0.048 g), lithium chloride (0.43 g) and DMF (10 mL) was stirred under an argon atmosphere at 90° C. for 2 hr. To the reaction mixture was added a saturated aqueous potassium fluoride solution at room temperature, and the resulting precipitate was filtered off. To the filtrate was added ethyl acetate, and the organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was crudely purified by silica gel column chromatography (ethyl acetate/hexane). A mixture of the obtained residue (0.39 g), osmium oxide (immobilized catalyst I) (0.17 g), sodium periodate (1.45 g) and acetonitrile (9 mL)-acetone (9 mL)-water (9 mL) was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. A mixture of the obtained residue (0.15 g), anhydrous magnesium sulfate (0.12 g), (2-fluoro-4-(1-methyl-1H-1,2,3-triazol-4-yl)phenyl)methanamine (0.11 g) and THF (4 mL) was stirred under an argon atmosphere at room temperature for 20 min. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was dissolved in acetic acid (4 mL), sodium triacetoxyhydroborate (0.16 g) was added to the mixture, and the mixture was stirred at room temperature overnight. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane), and crystallized from ethyl acetate/hexane to give the title compound (0.008 g).

¹H NMR (300 MHz, DMSO-d₆) δ 2.74-2.93 (2H, m), 4.09 (3H, s), 4.45 (2H, s), 4.64 (2H, t, J=6.1 Hz), 4.73 (2H, s), 7.25 (1H, d, J=5.3 Hz), 7.38 (1H, t, J=8.0 Hz), 7.66 (2H, d, J=9.6 Hz), 8.31 (1H, d, J=5.3 Hz), 8.57 (1H, s).

Example 20 4-(2,2-difluoropropoxy)-2-(4-(1,2-thiazol-5-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one

A mixture of 4-(2,2-difluoropropoxy)-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)-1H-pyrrolo[3,4-c]pyridin-3(2H)-one (0.060 g), 5-bromoisothiazole (0.029 g), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) methylene chloride adduct (0.006 g), 2 M aqueous sodium carbonate solution (0.14 mL) and DME (2 mL)-water (0.2 mL) was stirred under an argon atmosphere at 90° C. overnight. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane and silica gel, ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.003 g).

¹H NMR (300 MHz, CDCl₃) δ 1.87 (3H, t, J=18.9 Hz), 4.27 (2H, s), 4.71 (2H, t, J=11.6 Hz), 4.78 (2H, s), 6.72 (1H, s), 7.01 (1H, d, J=5.1 Hz), 7.39 (2H, dd, J=5.0, 3.1 Hz), 7.58 (2H, d, J=8.1 Hz), 8.25 (1H, d, J=5.3 Hz), 8.47 (1H, d, J=1.9 Hz).

Example 22 4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a mixture of methyl 4-(2,2-difluoropropoxy)-6-vinylpyrimidine-5-carboxylate (1.66 g), osmium oxide (immobilized catalyst I) (0.33 g) and acetonitrile (9 mL)-acetone (9 mL)-water (9 mL) was added sodium periodate (5.50 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. A mixture of a part (0.20 g) of the obtained residue, (4-(1,3-dimethyl-1H pyrazol-4-yl)phenyl)methanamine (0.16 g) and THF (3 mL) was stirred under an argon atmosphere at room temperature for 20 min. Methanol (1 mL) and sodium triacetoxyhydroborate (0.82 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. Sodium triacetoxyhydroborate (0.09 g) was further added, and the mixture was further stirred at room temperature for 20 min. The reaction mixture was neutralized with a saturated aqueous sodium hydrogen carbonate solution at room temperature, and extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diethyl ether to give the title compound (0.10 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.78 (3H, t, J=19.3 Hz), 2.27 (3H, s), 3.77 (3H, s), 4.48 (2H, s), 4.69 (2H, s), 4.82 (2H, t, J=12.8 Hz), 7.23-7.34 (2H, m), 7.36-7.45 (2H, m), 7.85 (1H, s), 8.95 (1H, s).

Example 23 4-(2,2-difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one

To a mixture of methyl 4-(2,2-difluoropropoxy)-6-vinylpyrimidine-5-carboxylate (1.66 g), osmium oxide (immobilized catalyst I) (0.33 g) and acetonitrile (9 mL)-acetone (9 mL)-water (9 mL) was added sodium periodate (5.50 g), and the mixture was stirred at room temperature overnight. The insoluble material was filtered off, and the filtrate was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. A mixture of a part (0.20 g) of the obtained residue, (4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorophenyl)methanamine (0.17 g) and THF (3 mL) was stirred under an argon atmosphere at room temperature for 20 min. Methanol (1 mL) and sodium triacetoxyhydroborate (0.82 g) were added to the reaction mixture, and the mixture was stirred at room temperature for 1 hr. Sodium triacetoxyhydroborate (0.09 g) was further added, and the mixture was further stirred at room temperature for 20 min. The reaction mixture was neutralized with a saturated aqueous sodium hydrogen carbonate solution at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and crystallized from ethyl acetate/diisopropyl ether to give the title compound (0.12 g).

¹H NMR (300 MHz, DMSO-d₆) δ 1.77 (3H, t, J=19.3 Hz), 2.29 (3H, s), 3.77 (3H, s), 4.51 (2H, s), 4.70-4.90 (4H, m), 7.19-7.29 (2H, m), 7.31-7.40 (1H, m), 7.95 (1H, s), 8.95 (1H, s).

The Example compounds produced according to the above-mentioned production method and the methods shown in the Examples, or methods analogous thereto are shown in the following Tables 1-20. In the Tables, MS shows measured values.

TABLE 1 Ex. No. IUPAC name structural formula MS 1 4-(2,2- difluoropropoxy)-6-(4- (1-ethyl-1H-pyrazol-4- yl)benzyl)-6,7-dihydro- 5H-pyrrolo[3,4- d]pyrimidin-5-one

414.1 2 4-(2,2-difluoroethoxy)- 6-(4-(1-ethyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H- pyrrolo[3,4- d]pyrimidin-5-one

400.1 3 4-(2,2- difluoropropoxy)-6- (4- (1-ethyl-1H-pyrazol-4- yl)-2-fluorobenzyl)- 6,7-dihydro-5H- pyrrolo[3,4- d]pyrimidin-5-one

432.1 4 4-(2,2-difluoroethoxy)- 6-(4-(1-ethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-6,7- dihydro-5H-pyrrolo[3, 4- d]pyrimidin-5-one

418.1 5 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)-4- (2-fluoro-2- methylpropoxy)-6,7- dihydro-5H-pyrrolo[3,4- d]pyrimidin-5-one

410.2 6 4-(2,2-difluoroethoxy)- 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

399.1

TABLE 2 Ex. No. IUPAC name structural formula MS 7 4-(2,2-difluorobutoxy)- 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo[3,4- c]pyridin-3-one

445.1 8 4-(2,2-difluorobutoxy)- 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H- pyrrolo[3,4- d]pyrimidin-5-one

428.1 9 6-(2-fluoro-4-(1- methyl-1H-pyrazol-3- yl)benzyl)-4-(2,2,2- trifluoroethoxy)-6,7- dihydro-5H-pyrrolo[3,4- d]pyrimidin-5-one

422.0 10 4-((4-(2,2- difluorobutoxy)-5-oxo- 5,7-dihydro-6H- pyrrolo[3,4- d]pyrimidin-6- yl)methyl)-N- methylbenzamide

391.0 11 6-(4-(2-methylpyridin- 4-yl)benzyl)-4-(2,2,2- trifluoroethoxy)-6,7- dihydro-5H-pyrrolo[3,4- d]pyrimidin-5-one

415.1 12 4-(2,2- difluoropropoxy)-2-(4- (1-(2,2,2- trifluoroethyl)-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

467.0

TABLE 3 Ex. No. IUPAC name structural formula MS 13 2-(4-(1-(2,2- difluoroethyl)-1H- pyrazol-4-yl)benzyl)-4- (2,2-difluoropropoxy)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

449.0 14 4-(2,2- difluoropropoxy)-2-(4- (2-methyl-2H-indazol-5- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4- c]pyridin-3-one

449.0 15 4-(2,2-difluoroethoxy)- 6-((5-(1,3-dimethyl-1H- pyrazol-4-yl)-3-fluoro- 2-thienyl)methyl)-6,7- dihydro-5H-pyrrolo[3,4- d]pyrimidin-5-one

423.9 16 2-(2-fluoro-4-(1- methyl-1H-1,2,3- triazol-4-yl)benzyl)-4- (3,3,3- trifluoropropoxy)-1,2- dihydro-3H-pyrrolo[3,4- c]pyridin-3-one

436.1 17 2-(4-(1-cyclopropyl-1H- pyrazol-4-yl)benzyl)-4- (2,2-difluoropropoxy)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

425.1 18 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)-4- (2,2,3,3- tetrafluoropropoxy)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

449.0

TABLE 4 Ex. No. IUPAC name structural formula MS 19 4-(2,2-difluorobutoxy)- 2-(4-(6-methylpyridazin- 4-yl)benzyl)-1,2- dihydro-3H-pyrrolo[3,4- c]pyridin-3-one

425.1 20 4-(2,2-difluoropropoxy)- 2-(4-(1,2-thiazol-5- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4- c]pyridin-3-one

402.1 21 4-(2,2-difluoropropoxy)- 2-(2-fluoro-4-(3- furyl)benzyl)-1,2- dihydro-3H-pyrrolo[3,4- c]pyridin-3-one

403.0 22 4-(2,2-difluoropropoxy)- 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H- pyrrolo[3,4-d]pyrimidin- 5-one

414.1 23 4-(2,2-difluoropropoxy)- 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-6,7- dihydro-5H-pyrrolo[3,4- d]pyrimidin-5-one

432.0

TABLE 5 Ex. No. IUPAC name structural formula MS 24 2-(4-bromo-2- fluorobenzyl)-4-(2,2- difluoropropoxy)-1,2- dihydro-3H- pyrrolo[3,4- c]pyridin-3-one

414.9 25 2-(4-bromo-2- fluorobenzyl)-4-(2,2- difluorobutoxy)-1,2- dihydro-3H- pyrrolo[3,4- c]pyridin-3-one

428.9 26 2-(4-bromo-2- fluorobenzyl)-4-(2- fluoro-2- methylpropoxy)- 1,2-dihydro-3H- pyrrolo[3,4-c] pyridin-3-one

410.9 27 2-(4-bromo-2- fluorobenzyl)-4-(2,2- difluoroethoxy)-1,2- dihydro-3H- pyrrolo[3,4- c]pyridin-3-one

400.8 28 2-(4-bromobenzyl)- 4-(2,2- difluorobutoxy)-1,2- dihydro-3H- pyrrolo[3,4- c]pyridin-3-one

410.9 29 4-(2,2- difluorobutoxy)-2- (piperidin-4- ylmethyl)- 1,2-dihydro-3H- pyrrolo[3,4-c] pyridin-3-one

340.2

TABLE 6 Ex. No. IUPAC name structural formula MS 30 4-(2,2-difluorobutoxy)-6- ((5-(1-ethyl-1H-pyrazol-4- yl)-2-thienyl)methyl)-6,7- dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

433.9 31 4-(2,2-difluorobutoxy)- 2-(piperidin-4-ylmethyl)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

340.1 32 tert-butyl 4-((4-(2,2- difluorobutoxy)-3-oxo-1, 3-dihydro-2H-pyrrolo [3,4-c]pyridin-2-yl) methyl)piperidine- 1-carboxylate

438.1 33 4-(2,2-difluorobutoxy)-6- ((5-(1,3-dimethyl-1H- pyrazol-4-yl)-2-thienyl) methyl)-6,7-dihydro- 5H-pyrrolo[3,4-d] pyrimidin-5-one

434.0 34 4-(2,2-difluoroethoxy)-6- ((5-(1,3-dimethyl-1H- pyrazol-4-yl)-2-thienyl) methyl)-6,7-dihydro- 5H-pyrrolo[3,4-d] pyrimidin-5-one

405.9 35 6-(4-(1-ethyl-1H-pyrazol- 4-yl)-2-fluorobenzyl)-4- (2,2,2-trifluoroethoxy)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

436.0

TABLE 7 Ex. No. IUPAC name structural formula MS 36 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-4-(2,2,2- trifluoroethoxy)-6,7- dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

436.0 37 6-(4-(1-ethyl-1H-pyrazol- 4-yl)benzyl)-4-(2,2,2- trifluoroethoxy)-6,7- dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

418.0 38 4-(2,2-difluoroethoxy)-2- ((5-(1-ethyl-1H-pyrazol- 4-yl)-2-thienyl)methyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

405.0 39 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)-4- (2,2,2-trifluoroethoxy)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

418.0 40 4-(2,2-difluoroethoxy)-6- (4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-6,7- dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

418.0 41 4-(2,2-difluoropropoxy)- 2-(1H-pyrazol-4- ylmethyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

309.1

TABLE 8 Ex. No. IUPAC name structural formula MS 42 4-(2,2-difluoroethoxy)- 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

400.1 43 4-(2,2-difluoroethoxy)- 2-((5-(1,3-dimethyl-1H- pyrazol-4-yl)-2-thienyl) methyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

405.0 44 6-(4-(1-ethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-4-(2- fluoro-2-methylpropoxy)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

428.1 45 6-(4-(1-ethyl-1H- pyrazol-4-yl)benzyl)- 4-(2-fluoro-2- methylpropoxy)-6,7- dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

410.1 46 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-4-(2- fluoro-2-methylpropoxy)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

428.2 47 2-((5-bromo-2-thienyl) methyl)-4-(2,2- difluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

388.8

TABLE 9 Ex. No. IUPAC name structural formula MS 48 4-((4-(2,2- difluorobutoxy)-3- oxo-1,3-dihydro-2H- pyrrolo[3,4-c]pyridin- 2-yl)methyl)-2- fluorobenzamide

394.1 49 4-((4-(2,2- difluorobutoxy)-3- oxo-1,3-dihydro-2H- pyrrolo[3,4-c]pyridin- 2-yl)methyl)-N- methylbenzamide

390.0 50 4-((4-(2,2- difluorobutoxy)-3- oxo-1,3-dihydro-2H- pyrrolo[3,4-c]pyridin- 2-yl)methyl)-2-fluoro- N-methylbenzamide

408.0 51 4-(2,2-difluorobutoxy)- 2-((5-(1,3-dimethyl-1H- pyrazol-4-yl)-2- thienyl)methyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

433.0 52 4-((4-(2,2- difluorobutoxy)-3- oxo-1,3-dihydro-2H- pyrrolo[3,4-c]pyridin- 2-yl)methyl)-N-ethyl- 2-fluorobenzamide

422.0 53 2-((5-bromo-2-thienyl) methyl)-4-(2,2- difluorobutoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

416.8

TABLE 10 Ex. No. IUPAC name structural formula MS 54 4-(2,2-difluorobutoxy)-2- (2-thienylmethyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

339.1 55 4-(2,2-difluoroethoxy)- 2-(2-thienylmethyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

311.1 56 4-(2,2-difluoroethoxy)- 2-(4-(1-(2,2- difluoroethyl)-1H- pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

453.1 57 4-(2,2-difluoroethoxy)- 2-(2-fluoro-4-(1-(2,2,2- trifluoroethyl)-1H- pyrazol-4-yl)benzyl-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

471.1 58 4-(2,2-difluoroethoxy)- 2-(4-(1-ethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

417.0 59 4-(2,2-difluorobutoxy)- 2-(4-(1-(2,2- difluoroethyl)-1H- pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

481.1

TABLE 11 Ex. No. IUPAC name structural formula MS 60 4-(2,2-difluorobutoxy)- 2-(4-(1-ethyl-1H-pyrazol- 4-yl)-2-fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

445.1 61 4-(2,2-difluoroethoxy)- 2-(4-(1-(2,2- difluoroethyl)-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

435.1 62 4-(2,2-difluorobutoxy)-2- (2-fluoro-4-(1-(2,2,2- trifluoroethyl)-1H- pyrazol-4-yl)benzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

499.1 63 4-(2,2-difluorobutoxy)- 2-(4-(1-(difluoromethyl)- 1H-pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

449.0 64 4-(2,2-difluoroethoxy)- 2-(4-(1-(difluoromethyl)- 1H-pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

421.0 65 4-(2,2-difluoroethoxy)- 2-(4-(1-(2,2,2- trifluoroethyl)-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

453.1

TABLE 12 Ex. No. IUPAC name structural formula MS 66 4-(2,2-difluoroethoxy)- 2-(4-(1-ethyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

399.0 67 6-(4-bromobenzyl)-4- (2,2-difluorobutoxy)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

412.0 68 4-(2,2-difluorobutoxy)- 6-(4-(1-ethyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

428.2 69 4-(2,2-difluorobutoxy)- (4-(1-(2,2,2- trifluoroethyl)-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

482.1 70 4-(2,2-difluoroethoxy)-2- (4-(1-methyl-1H-pyrrol- 2-yl)benzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

384.1 71 2-((1-benzyl-1H- pyrazol-4-yl)methyl)-4- (2,2-difluoropropoxy)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

399.1

TABLE 13 Ex. No. IUPAC name structural formula MS 72 4-(2,2-difluorobutoxy)- 2-(4-(1H-pyrazol-4- yl)benzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

399.1 73 4-(2,2-difluorobutoxy)- 2-(4-(1-(2,2,2- trifluoroethyl)-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

481.1 74 4-(2,2-difluorobutoxy)- 6-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-6,7- dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

446.1 75 4-(2,2-difluorobutoxy)- 6-(4-(1-methyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

414.1 76 4-(2,2-difluorobutoxy)- 2-(4-(1-(2,2- difluoroethyl)-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

463.1 77 4-(2,2-difluorobutoxy)- 2-(4-(1-ethyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

427.2

TABLE 14 Ex. No. IUPAC name structural formula MS 78 4-(2,2-difluoropropoxy)- 6-(4-(1-methyl-1H- pyrazol-4-yl) benzyl)-6,7-dihydro- 5H-pyrrolo[3,4-d] pyrimidin-5-one

400.1 79 4-(2,2-difluorobutoxy)- 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

427.2 80 4-((4-(2,2- difluoropropoxy)-3- oxo-1,3-dihydro-2H- pyrrolo[3,4-c]pyridin- 2-yl)methyl)-3- fluorobenzonitrile

362.1 81 4-(2-fluoro-2- methylpropoxy)-2-(2- fluoro-4-(1-methyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

413.1 82 2-(4-(1,3-dimethyl- 1H-pyrazol-4-yl)-2- fluorobenzyl)-4-(2- fluoro-2- methylpropoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

427.2 83 4-(2-fluoro-2- methylpropoxy)-2-(4-(1- methyl-1H-pyrazol-4- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

395.2

TABLE 15 Ex. No. IUPAC name structural formula MS 84 4-(2,2- difluoropropoxy)-2-(4- (1-ethyl-1H-pyrazol-4- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

413.1 85 4-(2,2- difluoropropoxy)-2-(4- (1H-pyrazol-4-yl) benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

385.1 86 4-(2,2- difluoropropoxy)-2- (2-fluoro-4-(1-methyl- 1H-pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

417.0 87 2-(2-fluoro-4-(1- methyl-1H-pyrazol-4- yl)benzyl)-4-(2,2,2- trifluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

421.0 88 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-4-(2,2,2- trifluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

435.1 89 2-(4-(1,3-dimethyl- 1H-pyrazol-4-yl) benzyl)-4-(2,2,2- trifluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

417.0

TABLE 16 Ex. No. IUPAC name structural formula MS 90 4-(2,2- difluoropropoxy)-2- (4-(1-methyl-1H- pyrazol-4-yl) benzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

399.1 92 4-(2,2- difluorobutoxy)-2-(2- fluoro-4-(1-methyl- 1H-pyrazol-4-yl) benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

431.0 93 4-(2,2- difluoroethoxy)-6- (4-(1-methyl-1H- pyrazol-4-yl)benzyl)- 6,7-dihydro-5H- pyrrolo[3,4-d] pyrimidin-5-one

386.0 94 2-(4-(1-methyl- 1H-pyrazol-4-yl) benzyl)-4-(2,2,2- trifluoroethoxy)- 1,2-dihydro-3H- pyrrolo[3,4-c] pyridin-3-one

403.1 95 4-(2,2- difluoroethoxy)-2- (4-(1-methyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H- pyrrolo[3,4-c] pyridin-3-one

385.1 96 2-(4-(2-methylpyridin- 4-yl)benzyl)-4-(2,2,2- trifluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

414.1

TABLE 17 Ex. No. IUPAC name structural formula MS 97 4-(2,2-difluorobutoxy)- 2-(2-fluoro-4-(1- methyl-1H-pyrazol-3- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

431.0 98 4-(2,2-difluorobutoxy)- 2-(4-(1-methyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

413.1 99 2-(4-(1,3-dimethyl- 1H-pyrazol-4-yl) benzyl)-4-(2-fluoro-2- methylpropoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

409.2 100 2-(4-cyclopropyl-2- fluorobenzyl)-4-(2,2- difluoropropoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

377.2 101 4-(2,2- difluoropropoxy)-2- (2-fluoro-4- (tetrahydrofuran-3- yl)benzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

407.1 102 4-(2,2- difluoropropoxy)-2- (2-fluoro-4-(1-methyl- 1H-pyrazol-3-yl) benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

417.1

TABLE 18 Ex. No. IUPAC name structural formula MS 103 4-(2,2-difluoropropoxy)- 2-((1-(2-methylpyridin- 4-yl)piperidin-4- yl)methyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

417.1 104 6-(4-(1-methyl-1H-1,2,3- triazol-4-yl)benzyl)-4- (2,2,2-trifluoroethoxy)- 6,7-dihydro-5H-pyrrolo [3,4-d]pyrimidin-5-one

405.1 105 4-(2,2-difluoropropoxy)- 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

413.2 106 4-(2,2-difluoropropoxy)- 2-(2-fluoro-4-(1-methyl- 1H-1,2,3-triazol-4- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

418.1 107 4-(2,2-difluoropropoxy)- 2-(4-(1-methyl-1H-1,2,3- triazol-4-yl)benzyl)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

400.1 108 4-(2,2-difluoropropoxy)- 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

431.1

TABLE 19 Ex. No. IUPAC name structural formula MS 109 4-(2,2-difluoroethoxy)- 2-(2-fluoro-4-(6- methylpyridazin-4- yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

415.1 110 4-(2,2-difluoroethoxy)- 2-(4-(1,5-dimethyl- 1H-pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

417.1 111 4-(2,2-difluoroethoxy)- 2-(2-fluoro-4-(1-methyl- 1H-pyrazol-3-yl) benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c] pyridin-3-one

403.1 112 4-(2,2-difluoroethoxy)- 2-(4-(1,3-dimethyl- 1H-pyrazol-4-yl)-2- fluorobenzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

417.1 113 4-(2,2-difluoroethoxy)- 2-(4-(2-methylpyridin- 4-yl)benzyl)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

396.2 114 2-(2-fluoro-4-(1- methyl-1H-1,2,3- triazol-4-yl)benzyl)- 4-(2,2,2- trifluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

422.0

TABLE 20 Ex. No. IUPAC name structural formula MS 115 4-(2,2-difluoroethoxy)- 2-(2-fluoro-4-(1-methyl- 1H-1,2,3-triazol-4-yl) benzyl)-1,2-dihydro-3H- pyrrolo[3,4-c]pyridin- 3-one

404.1 116 4-(2,2-difluoroethoxy)- 2-(4-(1-methyl-1H-pyrazol- 3-yl)benzyl)-1,2-dihydro- 3H-pyrrolo[3,4-c]pyridin- 3-one

385.1 117 2-(4-(1,3-dimethyl-1H- pyrazol-4-yl)benzyl)-4- (3,3,3-trifluoropropoxy)- 1,2-dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

431.1 118 2-(4-(1-methyl- 1H-pyrazol-3-yl) benzyl)-4-(2,2,2- trifluoroethoxy)-1,2- dihydro-3H-pyrrolo [3,4-c]pyridin-3-one

403.1

Formulation Example 1

(1) compound obtained in Example 1 10.0 g (2) Lactose 60.0 g (3) Cornstarch 35.0 g (4) Gelatin  3.0 g (5) Magnesium stearate  2.0 g

A mixture of the compound (10.0 g) obtained in Example 1, lactose (60.0 g) and cornstarch (35.0 g) is passed through a 1 mm mesh sieve and granulated by using 10 wt % aqueous gelatin solution (30 mL) (3.0 g as gelatin) and the granules are dried at 40° C. and sieved again. The obtained granules are mixed with magnesium stearate (2.0 g) and the mixture is compressed. The obtained core tablets are coated with a sugar coating of an aqueous suspension of sucrose, titanium dioxide, talc and gum arabic. The coated tablets are glazed with beeswax to give 1000 coated tablets.

Formulation Example 2

(1) compound obtained in Example 1 10.0 g (2) Lactose 70.0 g (3) Cornstarch 50.0 g (4) Soluble starch  7.0 g (5) Magnesium stearate  3.0 g

The compound (10.0 g) obtained in Example 1 and magnesium stearate (3.0 g) are granulated using aqueous soluble starch solution (70 mL) (7.0 g as soluble starch), dried and mixed with lactose (70.0 g) and cornstarch (50.0 g). The mixture is compressed to give 1000 tablets.

Experimental Example 1 Measurement of M1 Receptor Positive Allosteric Modulator (M1PAM) Activity

The activity of a test compound in the presence of acetylcholine at EC20 concentration (final concentration 0.6-0.8 nM), which affords an action corresponding to about 20% of the maximum activity, was measured as PAM activity. The method is as follows. CHO-K1 cells stably expressing a human M1 receptor (hCHRM1) were plated on a 384-well black clear bottom plate (BD Falcon) at 5,000 cells/well, and cultured in an incubator at 37° C., 5% CO₂ for 1 day. The medium in the cell plate was removed, and assay buffer A containing calcium indicator (Recording medium (DOJINDO LABORATORIES), 0.1% BSA (Wako Pure Chemical Industries, Ltd.), 2.5 μg/mL Fluo-4 AM (DOJINDO LABORATORIES), 0.08% Pluronic F127 (DOJINDO LABORATORIES), 1.25 mM probenecid (DOJINDO LABORATORIES)) was added at 30 μL/well. The cells were left standing in the incubator at 37° C., 5% CO₂ for 30 min, and further left standing at room temperature for 30 min. A test compound prepared by diluting with assay buffer B (HBSS (Invitrogen), 20 mM HEPES (Invitrogen), 0.1% BSA) containing 2.4-3.2 nM acetylcholine was added at 10 μL/well, and the fluorescence was measured by FLIPRtetra (Molecular Devices) for 1 min every 1 second. With the definition that the amount of change in the fluorescence on addition of acetylcholine (final concentration 1 μM) is 100% and that on addition of DMSO instead of a test compound is 0%, the activity (%) of the test compound was calculated, and the inflection point in the concentration-dependent curve of the test compound was calculated as IP values. The results are shown in Table 21.

TABLE 21 Experimental Example No. IP value (nM) activity (%) at 10 μM 1 17 91 2 31 108 3 8.9 103 4 8.7 99 5 17 105 6 70 109 7 9.1 90 8 23 109 9 77 102 10 33 103 11 23 87 12 59 97 13 55 100 14 51 88 15 16 100 16 85 111 17 95 99 18 280 102 19 240 98 20 360 91 21 290 101 22 28 100 23 6 94 30 96 103 34 77 100 35 27 98 36 22 99 37 46 98 39 40 93 40 9 96 42 23 106 44 6.7 86 45 10 87 46 5.2 90 56 21 102 57 18 101 58 35 104 59 17 107 60 7.4 94 61 51 91 62 40 91 63 96 91 65 91 106 66 66 105 68 7.1 97 69 9.6 88 72 59 90 73 50 94 74 8.7 101 75 13 98 76 45 94 77 68 99 78 19 95 81 32 88 82 17 95 84 72 96 86 21 91 87 32 101 88 74 101 92 15 94 97 77 104 104 61 95 106 29 90 107 72 92 108 16 94 112 41 101 114 56 102 115 43 98

Experimental Example 2 Measurement of Myo-Inositol 1 Phosphate (IP1)

Animals used were male Long-Evans rats. They were used after acclimation for at least 1 week. Test compounds were suspended in 0.5% (w/v) aqueous methylcellulose solution, and the suspension was orally administered to the rats. After a given time, lithium chloride was dissolved in saline and subcutaneously administered into the rats. After a given time, their bilateral hippocampi were isolated from the rats, and the wet weight thereof was measured. The isolated hippocampi were homogenized with HEPES buffer, followed by centrifugation. The IP1 and protein concentrations in the supernatant were measured by IP-One HTRF(R) assay kit (Cisbio Bioassays) and BCA protein assay kit (Thermo Scientific), respectively. The level of the IP1 production was expressed as the ratio of the concentration of IP1 to that of protein. The increase rate of the IP1 production was shown as a relative value when Vehicle administration group as 100%. The results are shown in Table 22.

TABLE 22 test compound (mg/kg) increase rate (% of Vehicle) Example No. 6 (30 mg/kg) 38 Example No. 22 (10 mg/kg) 71 Example No. 23 (3 mg/kg) 27

Experimental Example 3 Novel Object Recognition Test

Novel object recognition test is comprised of two trials called the acquisition and the retention trials. Scopolamine-induced memory deficits models were used for the test, and animals used were male Long-Evans rats (7-week-old). On the day before the test, for acclimation, the rats were allowed to freely move about the test box (40×40×50 cm) for 10 minutes. On the test day, the rats were acclimated to the test room for about 1 hr prior to the test. The test compounds were orally administered to the rats in a single dose 2 hours before the acquisition trial. For induction of learning and memory deficits, scopolamine (0.1 mg/kg) was subcutaneously administered into the rats 30 min before the acquisition trial. For the acquisition trial, two identical objects (A1, A2) were placed in the test box. The rats were put in the test box for 3 min, and the duration exploring each object was measured. The retention trial was performed 4 hr after the acquisition trial. For the retention trial, one familiar object (A3) used for the acquisition trial and one novel object (B) having a different shape from A3 were placed in the test box. After setting the objects, the rats were introduced into the test box and retention trial was performed for 3 min. The duration for exploring each object in the acquisition trial and the retention trial was measured, and the exploration rate of novel object was calculated. The exploration rate of novel object was expressed as (the duration exploring the novel object)/[(the duration exploring the novel object)+(the duration exploring the familiar object)]×100(%) at mean±standard error. The results are shown below.

exploration rate of novel object (%)

control group: 62.66±3.89%

solvent-scopolamine group: 49.62±1.44%

Example No. 6 (3 mg/kg)-scopolamine group: 58.75±2.01%

Example No. 6 (10 mg/kg)-scopolamine group: 52.48±2.28%

INDUSTRIAL APPLICABILITY

The compound of the present invention may be useful as a cholinergic muscarinic M1 receptor positive allosteric modulator, or a medicament such as an agent for the prophylaxis or treatment of Alzheimer's disease, schizophrenia, pain, sleep disorder, Parkinson's disease dementia, dementia with Lewy bodies and the like, and the like.

This application is based on a patent application No. 2014-102322 filed in Japan, the contents of which are incorporated in full herein. 

1. A compound represented by the formula (I):

wherein ring A is an optionally substituted 5- or 6-membered ring; R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; and X is —CH═ or —N═ or a salt thereof.
 2. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; ring A is a benzene ring, a 5- or 6-membered monocyclic aromatic heterocycle, or a 5- or 6-membered monocyclic non-aromatic heterocycle, each of which is optionally substituted by 1 to 3 substituents selected from (1) a halogen atom, (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group, (3) a 5- to 14-membered aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from (a) a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms, and (b) a C₃₋₆ cycloalkyl group, (4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group, (6) a C₃₋₆ cycloalkyl group, (7) a tetrahydrofuranyl group, (8) a C₇₋₁₆ aralkyl group, and (9) a carbamoyl group; and X is —CH═ or —N═, or a salt thereof.
 3. The compound according to claim 1, wherein ring A is a benzene ring, a 5- or 6-membered monocyclic aromatic heterocycle, or a 5- or 6-membered monocyclic non-aromatic heterocycle, each of which is optionally substituted by 1 to 3 substituents selected from (1) a halogen atom, (2) a mono- or di-C₁₋₆ alkyl-carbamoyl group, (3) a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from (a) a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms, and (b) a C₃₋₆ cycloalkyl group, (4) a cyano group, (5) a C₁₋₆ alkoxy-carbonyl group, (6) a C₃₋₆ cycloalkyl group, (7) a tetrahydrofuranyl group, (8) a C₇₋₁₆ aralkyl group, and (9) a carbamoyl group, or a salt thereof.
 4. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; and ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from (1) a halogen atom, (2) a mono-C₁₋₆ alkyl-carbamoyl group, and (3) (i) a pyrazolyl group, (ii) a triazolyl group, (iii) an isothiazolyl group, (iv) a pyridyl group, or (v) an indazolyl group, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms; and X is —CH═ or —N═, or a salt thereof.
 5. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from (1) a halogen atom, (2) a mono-C₁₋₆ alkyl-carbamoyl group, and (3) (i) a pyrazolyl group, or (ii) a pyridyl group, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms; and X is —N═, or a salt thereof.
 6. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; ring A is a benzene ring or a thiophene ring, each of which is optionally substituted by 1 to 3 substituents selected from (1) a halogen atom, and (2) (i) a pyrazolyl group, (ii) a triazolyl group, (iii) an isothiazolyl group, or (iv) an indazolyl group, each of which is optionally substituted by 1 to 3 substituents selected from a C₁₋₆ alkyl group optionally substituted by 1 to 3 halogen atoms; and X is —CH═, or a salt thereof.
 7. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; ring A is a benzene ring substituted by (1) one halogen atom, and/or (2) one pyrazolyl group substituted by 1 to 3 C₁₋₆ alkyl groups; and X is —CH═ or —N═, or a salt thereof.
 8. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; ring A is a benzene ring substituted by (1) one halogen atom, and/or (2) one pyrazolyl group substituted by 1 to 3 C₁₋₆ alkyl groups; and X is —N═, or a salt thereof.
 9. The compound according to claim 1, wherein R is a C₁₋₆ alkyl group substituted by 1 to 5 halogen atoms; ring A is a benzene ring substituted by one pyrazolyl group substituted by 1 to 3 C₁₋₆ alkyl groups; and X is —CH═, or a salt thereof.
 10. 4-(2,2-Difluoroethoxy)-2-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-1,2-dihydro-3H-pyrrolo[3,4-c]pyridin-3-one or a salt thereof.
 11. 4-(2,2-Difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)benzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one or a salt thereof.
 12. 4-(2,2-Difluoropropoxy)-6-(4-(1,3-dimethyl-1H-pyrazol-4-yl)-2-fluorobenzyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-5-one or a salt thereof.
 13. A medicament comprising the compound according to claim 1 or a salt thereof.
 14. The medicament according to claim 13, which is a cholinergic muscarinic M1 receptor positive allosteric modulator.
 15. The medicament according to claim 13, which is a prophylactic or therapeutic agent for Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies.
 16. The compound according to claim 1 or a salt thereof for use in the prophylaxis or treatment of Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies.
 17. A method of cholinergic muscarinic M1 receptor positive allosteric modulation in a mammal, comprising administering an effective amount of the compound according to claim 1 or a salt thereof to said mammal.
 18. A method for the prophylaxis or treatment of Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies in a mammal, comprising administering an effective amount of the compound according to claim 1 or a salt thereof to said mammal.
 19. Use of the compound according to claim 1 or a salt thereof in the production of a prophylactic or therapeutic agent for Alzheimer's disease, schizophrenia, pain, a sleep disorder, Parkinson's disease dementia, or dementia with Lewy bodies. 